An element A reacts with oxygen to form A₂O. (a)State the number of electrons in the outermost orbit of A.
(b)To which group of the periodic table does A belong?
(c)State whether A is a metal or a non-metal.

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Solution

1) Element A has one valence electron as its valency is one in compound A₂O.
2) The element A belongs to first group .
3) Element A is a metal as it has one valence electron in its outermost shell.

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