GCSE Chemistry 2: Why does it become harder for halogens to gain an extra electron down the group?

Question

Why does it become harder for halogens to gain an extra electron down the group?

daavide · Accepted Answer

It becomes harder down the group because the number of electron shells in each atom increases, causing the outer shell to be further away from the positive nucleus.

GCSE Chemistry 2

Why does it become harder for halogens to gain an extra electron down the group?

It becomes harder down the group because the number of electron shells in each atom increases, causing the outer shell to be further away from the positive nucleus.

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