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Cool Chemistry: Atomic Radius, Ionisation Energy & Melting Points

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Ahmed Nour ✓™

9/16/2023

Chemistry

Trends in periodic table

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Cool Chemistry: Atomic Radius, Ionisation Energy & Melting Points

The atomic structure and periodic trends guide explores key concepts in atomic properties and bonding patterns.

• Trends in atomic radius across periods show a consistent decrease due to increased nuclear attraction
• Ionisation energy exceptions in periodic table occur notably in groups 2/3 and 5/6
• Melting points across period 2 and 3 in chemistry demonstrate varying patterns based on bonding types
• Successive ionisation energies provide insights into electron configuration and group determination
• Intermolecular forces play a crucial role in determining physical properties

...

9/16/2023

166

Atomic Radius. TRENDS decreases across period → greater attraction between outer electrons and nucleus Ionisation Energies. eg. Sodium (Na)

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Melting Points and Molecular Structure

This page details the relationship between melting points and molecular structure across periods 2 and 3. The trends vary significantly based on bonding types and molecular arrangements.

Definition: Melting point is the temperature at which a solid transitions to a liquid state.

Example: In period 3, elements like sodium (Na) and magnesium (Mg) show increasing melting points due to stronger metallic bonding.

Highlight: Covalent structures with multiple bonds require more energy to break, resulting in higher melting points.

Vocabulary: IMF (Intermolecular Forces) are the attractive forces between molecules that influence physical properties like melting point.

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Subjects

Chemistry

Atomic Structure and Properties

Periodic Trends

Periodic

 

Chemistry

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166

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Sep 16, 2023

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2 pages

Cool Chemistry: Atomic Radius, Ionisation Energy & Melting Points

user profile picture

Ahmed Nour ✓™

@ahmednour

The atomic structure and periodic trends guide explores key concepts in atomic properties and bonding patterns.

• Trends in atomic radius across periods show a consistent decrease due to increased nuclear attraction
• Ionisation energy exceptions in periodic tableoccur... Show more

Atomic Radius. TRENDS decreases across period → greater attraction between outer electrons and nucleus Ionisation Energies. eg. Sodium (Na)

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Melting Points and Molecular Structure

This page details the relationship between melting points and molecular structure across periods 2 and 3. The trends vary significantly based on bonding types and molecular arrangements.

Definition: Melting point is the temperature at which a solid transitions to a liquid state.

Example: In period 3, elements like sodium (Na) and magnesium (Mg) show increasing melting points due to stronger metallic bonding.

Highlight: Covalent structures with multiple bonds require more energy to break, resulting in higher melting points.

Vocabulary: IMF (Intermolecular Forces) are the attractive forces between molecules that influence physical properties like melting point.

Atomic Radius. TRENDS decreases across period → greater attraction between outer electrons and nucleus Ionisation Energies. eg. Sodium (Na)

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Atomic Structure and Ionisation Energy

This page explores fundamental atomic properties and ionisation energy trends across the periodic table. The atomic radius demonstrates predictable patterns, decreasing across periods due to stronger nuclear attraction to outer electrons. Ionisation energies follow specific trends with notable exceptions.

Definition: Ionisation energy is the energy required to remove one outer electron from each atom of gaseous atoms to form ions.

Example: Sodium (Na) ionisation process: Na(g) → Na+(g) + e-

Highlight: The biggest jump between successive ionisation energies indicates an element's group position in the periodic table.

Vocabulary: Electron shielding refers to inner electrons reducing the nuclear attraction to outer electrons.

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