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The formula of an ionic compound is A(2)...

The formula of an ionic compound is `A_(2)B` the number of valence electrons in `B` and `A` respectively

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The formula of a compound is A_(2)B_(5). The number of electrons in the outermst shells of A and B respectively are:

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The formula of a compound is X_(3)Y . The valencies of element X and Y will be respectively :

Two elements X and Y belong to groups 1 and 2 respectively in the same period. Compare them with respect to (a) the number of electrons in the outermost shell, (b) the number of valence electrons , (c) metallic character, (d) size of the atoms and ( e) formulae of the oxdies , hydrides and chlorides.

(a) What is the number of valence electrons in the atoms of first element in a period? (b) What is the usual number of valence electrons in the atoms of the last element in a period?