Question

2
49. The radius of which ion is closest to that of Li+ ion?
(a) Na+
(b) Be 2+
(c) Mg 2+
(d) Al 3+​

Answer 1

Answer:

ion is closest to Na+

Option A

Explanation:

The ionic size increases down the group and decrease across the period. Now, lithium belongs to the second period and sodium in the third. Whereas beryllium belongs to the second period and magnesium in the third.

Hence, the size of sodium ion is maximum followed by lithium, then comes magnesium and lastly beryllium. It is seen that sodium and lithium sizes are almost the same because they are just down a series and just have an extra shell.