Question

For elements in group 1,2 and 3 the number electrons lost is the same as

1) Captionless Image
2) Atomic number
3) Group number
4) Mass number

Answer 1

Answer:

The answer is Atomic number

Answer 2

Answer:

3) Group number

Explanation:

Valency is the combinig capicty of an atom, i.e. gain or loss of valence elecrons.

As we move from left to right in a period, the valency increases from 1 to 4 and then decreses to 0.

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