Arrange in order of atomic and ionic radii:
$(a) N i, C u, Z n$
$(b) H^{+}, H, H^{-}$
$(c) C r, V, T i, S c$
$(d) I^{+}, I, I^{-}$
$(e) C u, A g, A u$
$(f) B, B e, A l, M g$

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Solution

$(a)$ $N i < C u < Z n$ Atomic radius increases from left to right
$(b)$ $H^{+} < H < H^{-}$ cation size < neutral
atom size < anion size
$(c)$ $S c > T i > V > C r$ For period & elements atomic size first decreases then increases (due to paring of electrons in their $d - o r b i t a l s$ )
$(d)$ $I^{+} < I < I^{-}$ cation size < neutral
atom size < anion size
$(e)$ $C u < A g < A u$ Atomic size increases from top to bottom in a group
$(f)$ $B < A l < B e < M g$
Top to bottom, size increases
left to right, size decreases.

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A l, C u, F e, M g

Z n

E_{A l^{3} + / A l}^{0} + - 1.66 V, E_{C u^{2} + / C u}^{0} = + 0.34 V

E_{F e^{2} + / F e}^{0} = - 0.44 V, E_{M g^{2} + / M g}^{0} = - 1.40 V

E_{Z n^{2} + / Z n}^{0} = - 0.76 V

C a, N a, M g, Z n, F e, H, C u, H g, A g, A u

Identify the correct descending order of equivalent weights :

I) Ag II) H III) Cu IV) Zn

C a, C u, H g, A l, A g, K, Z n

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$(a)$	$N i < C u < Z n$	Atomic radius increases from left to right
$(b)$	$H^{+} < H < H^{-}$	cation size < neutral atom size < anion size
$(c)$	$S c > T i > V > C r$	For period & elements atomic size first decreases then increases (due to paring of electrons in their $d - o r b i t a l s$ )
$(d)$	$I^{+} < I < I^{-}$	cation size < neutral atom size < anion size
$(e)$	$C u < A g < A u$	Atomic size increases from top to bottom in a group
$(f)$	$B < A l < B e < M g$	Top to bottom, size increases left to right, size decreases.