Question

7) Which of the following has the smallest size
a)NA+
B)MG+2
C)CL-
D)F-​

Answer 1

Answer:

F- is the smallest .........

Answer 2

Explanation:

The ionic size is smallest for Mg

2+

. Na

+

and Mg

2+

contains 2 shells of electrons whereas Cl

−

and S

2−

contain 3 shells of electrons. Hence the ionic radii of Na

+

and Mg

2+

are smaller than the ionic radii of Cl

−

and S

2−

. Mg

2+

and Na

+

are isoelectronic species. The effective nuclear charge of Mg

2+

is higher than the effective nuclear charge of Na

+

. Hence, the ionic radius of Mg

2+

is smallest.