Changes

====[[Group 1]]: The [[Alkali Metal]]====

=====Chemical Properties=====

: '''Alkali Metals''' all [[Chemical Reaction|react]] strongly with [[water]] to produce [[Metal Hydroxide|metal hydroxides]] and [[Hydrogen]] [[gas]].

: '''Alkali Metals''' all produce strong [[alkali]]s.

The [[reactivity]] increases as you go down the group because:

*The outer [[electron]] is further away from the [[Atomic Nucleus|nucleus]] with each additional [[Electron Orbital|electron shell]] making the [[force]] of [[attract]]ion weaker. This makes it easier for an [[atom]] to lose it's outer [[electron]].

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=====Physical Properties=====

: '''Alkali Metals''' are all [[solid]] at [[Room Temperature|room temperature]] but have a low [[Melting Point|melting point]] compared to other [[metal]]s.

: '''Alkali Metals''' are soft and can be easily cut.

====[[Group 7]]: The [[Halogen]]s====

The [[reactivity]] decreases as you go down the group because:

*The outer [[electron]]s are further away from the [[Atomic Nucleus|nucleus]] with each additional [[Electron Orbital|electron shell]] making the [[force]] of [[attract]]ion weaker. This makes it less able to gain an extra [[electron]].

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=====Physical Properties=====

: The '''Nobel Gases''' are all [[gas]]es at [[Room Temperature|room temperature]].

: The [[density]] and [[Boiling Point|boiling point]] all increase as you go down the [[Periodic Table]].