Question

An element A on combining with O2 produce an oxide A2O which is basic in nature.

i) how many electrons must be there in the outerost shell of the element A ?

ii) To which group of periodic table it belongs ?

iii) identify whether it is a metal or a non metal ?

Answer 1

i) 1

ii) 1

iii) metal

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Answer 2

1-there are only 1 electron in its outermost shell .as from the formula by

by writing opposite to the cross multiplication method it found to be 1 .

2-it belongs to group 1 bcz its valency is 1


3-- since it has a valency of 1 and it form
basic oxide therefore it is a metal .