Study notes
Patterns in the Periodic Table
How the Periodic Table is arranged by proton number, how outer electrons relate to charge and reactivity, and the trends across Group 1 and Group 17.
What this topic covers
- The Periodic Table is arranged by increasing proton number
- The period number equals the number of occupied electron shells
- The group number relates to the number of outer (valence) electrons
- Elements in the same group share similar chemical properties
- The number of outer electrons predicts ionic charge
- Metallic character decreases and non-metallic character increases across a period
- Group 1, the alkali metals, become more reactive down the group
- Group 17, the halogens, become less reactive down the group
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