Question

which of the following has smallest radius

Answer 1

We have to keep in mind the following points :-

1. As we move down the group the size increases.

2. As we move move from left to right in a particular period the size decreases.

3. As the positive charge on an element increases, the size decreases because as more and more electrons goes , the nuclear attraction increases , and the size of the atom decreases .

"K+ > Li+ > Ba2+ > Be2+"

Answer 2

Beryllium has smallest radius