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Consider the following three compounds (...

Consider the following three compounds `(i)AX_(2n)^(n-)`, (ii)`AX_(3n)` and (ii)`AX_(4n)^(n+)`, where central atom A is 15th group element and their maximum covalency is 3n. If total number of proton in surrounding atom X is n and value of n is one, then calculate value of `x^(3)+y^(2)+z^(2)` . (where x, y and z are total number of lone pair at central atom in compounds (i), (ii) and (iii) respectively.

A

3

B

2

C

5

D

9

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