Question

why does the number of shells increases as we go down the group for 1 marks​

Answer 1

Answer:

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Explanation:

There are more electron shells between the outer shell and nucleus, which causes electron shielding.In an A-level exam you would get 3 marks for saying, "as you go down group 1 the number of electron shells increase, therefore the atomic radius increases

Answer 2

Explanation:

Explaining trends

The reactivity of Group 1 elements increases as you go down the group because: ... the outer electron gets further from the nucleus as you go down the group. the attraction between the nucleus and outer electron gets weaker as you go down the group - so the electron is more easily lost.

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