Question

The ions
02-, F-, Na+ , Mg2+ and A13+
are isoelectronic. Their ionic radii
shows
SEA
3
2
(1)
1
an increase from
02- to F and then
decrease from
Natto Al3+
(2)
an decrease from
02-to F- and then
decrease from
M ++ A13+​

Answer 1

Explanation:

As we move along a period, size decreases and as we move down the group size increases so here

Z electron

Na

+

11 10

Mg

2+

12 10

Al

+3

13 10

F

−

9 10

Above are isoelectronic species, hence size ∝

Z

1

So size decreases from O

−2

to Al

+3

.