Kindly 9th one with proper explanation

Hi,

a) A is a non metal : In a periodic table, Group 15 lie at right hand side of the periodic table and when we move across left to right in a period metallic character decreases.

b) D is more electronegative than E : Down the group electronegativity decreases due to increase in size and decrease in nuclear effect down the group.

c) Anion formed by C is C​2-. It can easily gain 2 electrons and achieve noble gas configuration. 

Regards

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