Question

Arrange each of the following sets of atoms and ions, in order of increasing size: (a) Sea., S2, Sn2+; (b) 02, K+, Rb+. The a

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Answer #1

Size of anions increases by gaining the electrons.

Size of cations decreases by loosing the electrons.

Se2- = 198 pm

S2- = 184 pm

Sn2+ = 118 pm

Increasing order of ion sizes.   a) Sn2+ < S2- < Se2-

Rb+ = 152 pm

K+ = 138 pm

O2- = 140 pm

Increasing order of ion sizes. b) K+ < O2- < Rb+

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