Question

By increasing the atomic number in group (1A) the…………….increases.

(a) oxidation number

(b) electron affinity

(C) Non metallic property

(d) metallic property

Answer 1

D is the correct option.

A is incorrect because all elements in group 1A only show a group oxidation state of +1.

B is incorrect because down the group size increases and electron gain enthalpy is inversely proportional to size so ΔegH decreases.

C is incorrect because non metallic character is directly proportional to ΔegH.

So we are left with the option D which correct because as we move the group the ionisation enthalpy decreases and tendency to lose electron increases which implies metallic character increases.

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