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C2.5 Explaining Trends - Coggle Diagram
C2.5 Explaining Trends
Reactivity within groups
As you go down a group in the periodic table, the number of shells occupied by electrons increases, by one extra electron shell per period.
This means that the atoms become larger going down any group.
This has two effects
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This happens because the outer electrons (negatively charged) are further away from the attractive force, the Nucleus (positively charged).
Inner shells of electrons shield the outer electrons from the positive charge of the nucleus.
Example: Alkali metals (lose) & Halogens (gain)
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