Question

two elements 'p' and 'q' belong to the same period of the modern periodic table and are in group -1 and group -2 respectively compare the following characteristics (a) the number of valence electrons in their atom(b) formula of their oxides (c) formula if there chlorides

Answer 1

a). Number of valence electron increases when we move from left to right in a period So,Number of valence electron in the atom of 'p'=1.
number of valence electron in the atom of'q'=2.

b). formula of oxides of 'p'= P20. and formula of oxides of 'q' = QO.

C). Formula of chlorides of 'p'=PCl
and formula of chlorides of 'q'=QCl2.

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Answer 2

Explanation:

1. as we move from left to right in a same period then the number of valance electron increases.. so the number of valance electron of p is 1 and q is 2...
2. by criss cross method formula of their oxide comes out tob be..... P2O and QO...
3. same as above the formula of their chlorides is PCl and QCl2....

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