Mutleybm1996
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Could someone explain briefly why reactivity decreases down group 7 and increases down group2?

Thanks


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interstitial
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(Original post by benwalters1996)
Could someone explain briefly why reactivity decreases down group 7 and increases down group2?

Thanks


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Group 2 form positive ions.

The atoms get larger, so there is more electron shielding and less nuclear attraction due to the increased atomic radius so it is easier for them to lose electrons from the outer shell, therefore it is easier for them to react.

Vice versa for Group 7.

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MidnightDream
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As you down a group the atomic radii increases, there is more electron shielding, more distance for the nucleus and therefore less nuclear attraction. Therefore as Group 2 lose electrons to form positive ions it is easier to do so as less energy is needed whereas Group 7 want to attract an electron to form negative ions and this is harder due to the decreased nuclear attraction and so reactivity decreases down the group for group 7 and the reverse is true for group 2

I think that's about right, hope it helped
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Pigster
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Also you should say that the number of p+ increases as you go down the group, but this is less important than shells & shielding.
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