Periodic Table Organization
The Periodic Table arranges elements in order of increasing atomic number. Elements are organized in periods (horizontal rows) and groups (vertical columns) that reveal important patterns in chemical properties.
Elements are broadly categorized as metals, non-metals, or metalloids. Metals (on the left and middle) typically conduct electricity, while non-metals (upper right) generally don't. Metalloids, which sit along a diagonal border, show properties of both.
Special groups include the alkali metals (Group 1), alkaline earth metals (Group 2), halogens (Group 17), and noble gases (Group 18). The middle section contains transition metals like iron, gold, and copper.
Remember This: Elements in the same group have similar chemical properties because they have the same number of electrons in their outer shell!
At the bottom of the table, the lanthanide and actinide series are separated out to keep the table from becoming too wide. These special groups of elements have unique properties and applications in technology and science.