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There are four elements 'P' , 'q' , 'r' ...

There are four elements 'P' , 'q' , 'r' and 's' having atomic numbers Z-1, Z, Z+1 and Z+2 respectively. If the element 'q' is an insert gas, select the correct answer from the following statements.
(i) 'p' has most negative electron gain enthalpy in the respective period.
(ii) 'r' is an alkali metal
(iii) 's' exists in stable +1 oxidation state.

A

I and ii

B

ii and iii

C

I and iii

D

I, ii and iii

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The correct Answer is:
A
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