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Updated Mar 16, 2026
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Tendencias y Propiedades en la Tabla Periódica
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Introducción a las Propiedades Periódicas
Las propiedades periódicas son las características de los elementos que varían de forma predecible en la tabla periódica. Esta periodicidad se debe a cómo se repiten las configuraciones electrónicas de la capa de valencia.
Hay dos conceptos clave que explican todo: la carga nuclear efectiva es la carga positiva "real" que siente un electrón de valencia. No es igual al número atómico porque los electrones internos "apantallan" parte de esa carga.
En un periodo (→): Z_ef aumenta porque hay más protones pero los electrones van a la misma capa. En un grupo (↓): Z_ef se mantiene casi constante para la última capa porque aunque hay más protones, también hay más capas internas que apantallan.
¡Dato clave! El efecto pantalla es como un escudo: los electrones internos protegen a los de valencia de la atracción total del núcleo.
Radio Atómico
El radio atómico es la mitad de la distancia entre núcleos de dos átomos idénticos enlazados. Es como medir el "tamaño" de un átomo.
En un grupo (↓): aumenta porque se añaden nuevas capas electrónicas. Cada capa nueva está más lejos del núcleo, así que el átomo es más grande. En un periodo (→): disminuye porque aunque el número de capas es el mismo, la Z_ef aumenta y "tira" más fuerte de los electrones, contrayendo el átomo.
Piénsalo así: es como si el núcleo fuera un imán que se hace más fuerte hacia la derecha (mismo periodo) pero más débil hacia abajo (mismo grupo) debido a la distancia.
Truco para recordar: Los átomos más grandes están en la esquina inferior izquierda, los más pequeños en la superior derecha.
Radio Iónico
Cuando un átomo gana o pierde electrones, su tamaño cambia drásticamente. Los cationes (iones positivos) son más pequeños que el átomo neutro porque al perder electrones, a menudo se pierde toda la capa de valencia y los restantes son atraídos con más fuerza.
Los aniones (iones negativos) son más grandes que el átomo neutro. Al ganar electrones en la misma capa, aumenta la repulsión entre ellos y la nube electrónica se expande.
Para especies isoelectrónicas (mismo número de electrones), a más protones en el núcleo, menor radio. Es lógico: más "tirón" hacia el centro.
Regla fácil: Perder electrones = encogerse, ganar electrones = hincharse.
Energía de Ionización
La energía de ionización (EI) es la energía necesaria para "arrancar" un electrón de un átomo gaseoso. Es como la fuerza que necesitas para separar algo que está pegado.
En un grupo (↓): disminuye porque los electrones están más lejos y más apantallados. En un periodo (→): aumenta porque la Z_ef aumenta y los electrones están más "pegados" al núcleo.
¡Cuidado con las excepciones! Grupo 2 vs. 13: El grupo 13 tiene EI menor porque es más fácil quitar un electrón p que uno de un orbital s completo. Grupo 15 vs. 16: El grupo 16 tiene EI menor porque elimina la repulsión de electrones emparejados.
Para examen: Aprende las excepciones de memoria. Be > B y N > O son preguntas típicas.
Afinidad Electrónica y Electronegatividad
La afinidad electrónica (AE) mide cuánto "le gusta" a un átomo aceptar un electrón. Si es muy negativa, significa que libera mucha energía al aceptarlo (es favorable).
En un grupo (↓): menos negativa (menos favorable) porque el electrón entrante está más lejos del núcleo. En un periodo (→): más negativa (más favorable) porque la Z_ef aumenta.
La electronegatividad es la capacidad de atraer electrones en un enlace. El flúor es el más electronegativo (4.0 en la escala de Pauling). Sigue las mismas tendencias: aumenta hacia la derecha y hacia arriba.
Dato importante: Los gases nobles tienen AE positiva - ¡no quieren electrones extra!
Ejemplos y Casos Prácticos
Para ordenar por radio atómico creciente: P, Cl, Na, Al (todos del periodo 3), aplicamos que el radio disminuye hacia la derecha. Resultado: Cl < P < Al < Na.
Para comparar energías de ionización entre Mg y Al, aunque Al está más a la derecha, EI(Mg) > EI(Al) por la excepción del grupo 2 vs. 13. El electrón 3p del Al es más fácil de arrancar que el 3s del Mg.
Las especies isoelectrónicas como O²⁻, F⁻, Ne, Na⁺, Mg²⁺ se ordenan por número de protones: a más protones, menor radio.
Clave del éxito: En el examen, siempre justifica con Z_ef y apantallamiento, no solo digas "aumenta hacia la derecha".
Resumen para Repasar
| Propiedad | Periodo (→) | Grupo (↓) | Razón |
|---|---|---|---|
| **Radio atómico** | Disminuye | Aumenta | Z_ef vs. capas nuevas |
| **Energía ionización** | Aumenta* | Disminuye | Z_ef vs. distancia+pantalla |
| **Afinidad electrónica** | Más negativa | Menos negativa | Z_ef vs. distancia+pantalla |
| **Electronegatividad** | Aumenta | Disminuye | Z_ef vs. distancia+pantalla |
*Con excepciones importantes
Lo esencial para el examen: definiciones, tendencias generales, justificaciones con Z_ef, excepciones de EI (G2 vs G13, G15 vs G16), y comparación de radios iónicos.
Consejo final: Practica con ejemplos hasta que puedas predecir propiedades sin mirar la tabla. ¡Es como tener superpoderes químicos!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
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Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
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I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
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Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Tendencias y Propiedades en la Tabla Periódica
¿Alguna vez te has preguntado por qué algunos elementos reaccionan violentamente y otros apenas lo hacen? La respuesta está en las propiedades periódicas, esas características que cambian de manera predecible a lo largo de la tabla periódica. Dominar estas tendencias... Show more
Introducción a las Propiedades Periódicas
Las propiedades periódicas son las características de los elementos que varían de forma predecible en la tabla periódica. Esta periodicidad se debe a cómo se repiten las configuraciones electrónicas de la capa de valencia.
Hay dos conceptos clave que explican todo: la carga nuclear efectiva es la carga positiva "real" que siente un electrón de valencia. No es igual al número atómico porque los electrones internos "apantallan" parte de esa carga.
En un periodo (→): Z_ef aumenta porque hay más protones pero los electrones van a la misma capa. En un grupo (↓): Z_ef se mantiene casi constante para la última capa porque aunque hay más protones, también hay más capas internas que apantallan.
¡Dato clave! El efecto pantalla es como un escudo: los electrones internos protegen a los de valencia de la atracción total del núcleo.
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Radio Atómico
El radio atómico es la mitad de la distancia entre núcleos de dos átomos idénticos enlazados. Es como medir el "tamaño" de un átomo.
En un grupo (↓): aumenta porque se añaden nuevas capas electrónicas. Cada capa nueva está más lejos del núcleo, así que el átomo es más grande. En un periodo (→): disminuye porque aunque el número de capas es el mismo, la Z_ef aumenta y "tira" más fuerte de los electrones, contrayendo el átomo.
Piénsalo así: es como si el núcleo fuera un imán que se hace más fuerte hacia la derecha (mismo periodo) pero más débil hacia abajo (mismo grupo) debido a la distancia.
Truco para recordar: Los átomos más grandes están en la esquina inferior izquierda, los más pequeños en la superior derecha.
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Radio Iónico
Cuando un átomo gana o pierde electrones, su tamaño cambia drásticamente. Los cationes (iones positivos) son más pequeños que el átomo neutro porque al perder electrones, a menudo se pierde toda la capa de valencia y los restantes son atraídos con más fuerza.
Los aniones (iones negativos) son más grandes que el átomo neutro. Al ganar electrones en la misma capa, aumenta la repulsión entre ellos y la nube electrónica se expande.
Para especies isoelectrónicas (mismo número de electrones), a más protones en el núcleo, menor radio. Es lógico: más "tirón" hacia el centro.
Regla fácil: Perder electrones = encogerse, ganar electrones = hincharse.
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Energía de Ionización
La energía de ionización (EI) es la energía necesaria para "arrancar" un electrón de un átomo gaseoso. Es como la fuerza que necesitas para separar algo que está pegado.
En un grupo (↓): disminuye porque los electrones están más lejos y más apantallados. En un periodo (→): aumenta porque la Z_ef aumenta y los electrones están más "pegados" al núcleo.
¡Cuidado con las excepciones! Grupo 2 vs. 13: El grupo 13 tiene EI menor porque es más fácil quitar un electrón p que uno de un orbital s completo. Grupo 15 vs. 16: El grupo 16 tiene EI menor porque elimina la repulsión de electrones emparejados.
Para examen: Aprende las excepciones de memoria. Be > B y N > O son preguntas típicas.
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Afinidad Electrónica y Electronegatividad
La afinidad electrónica (AE) mide cuánto "le gusta" a un átomo aceptar un electrón. Si es muy negativa, significa que libera mucha energía al aceptarlo (es favorable).
En un grupo (↓): menos negativa (menos favorable) porque el electrón entrante está más lejos del núcleo. En un periodo (→): más negativa (más favorable) porque la Z_ef aumenta.
La electronegatividad es la capacidad de atraer electrones en un enlace. El flúor es el más electronegativo (4.0 en la escala de Pauling). Sigue las mismas tendencias: aumenta hacia la derecha y hacia arriba.
Dato importante: Los gases nobles tienen AE positiva - ¡no quieren electrones extra!
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Ejemplos y Casos Prácticos
Para ordenar por radio atómico creciente: P, Cl, Na, Al (todos del periodo 3), aplicamos que el radio disminuye hacia la derecha. Resultado: Cl < P < Al < Na.
Para comparar energías de ionización entre Mg y Al, aunque Al está más a la derecha, EI(Mg) > EI(Al) por la excepción del grupo 2 vs. 13. El electrón 3p del Al es más fácil de arrancar que el 3s del Mg.
Las especies isoelectrónicas como O²⁻, F⁻, Ne, Na⁺, Mg²⁺ se ordenan por número de protones: a más protones, menor radio.
Clave del éxito: En el examen, siempre justifica con Z_ef y apantallamiento, no solo digas "aumenta hacia la derecha".
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Resumen para Repasar
| Propiedad | Periodo (→) | Grupo (↓) | Razón |
|---|---|---|---|
| **Radio atómico** | Disminuye | Aumenta | Z_ef vs. capas nuevas |
| **Energía ionización** | Aumenta* | Disminuye | Z_ef vs. distancia+pantalla |
| **Afinidad electrónica** | Más negativa | Menos negativa | Z_ef vs. distancia+pantalla |
| **Electronegatividad** | Aumenta | Disminuye | Z_ef vs. distancia+pantalla |
*Con excepciones importantes
Lo esencial para el examen: definiciones, tendencias generales, justificaciones con Z_ef, excepciones de EI (G2 vs G13, G15 vs G16), y comparación de radios iónicos.
Consejo final: Practica con ejemplos hasta que puedas predecir propiedades sin mirar la tabla. ¡Es como tener superpoderes químicos!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user