Question

which one of the following has smallest radius
1- Cl¯
2-S2¯
3-K+
4-Al
Explain with reason ​

Answer 1

Answer:

Al has the smallest radius.

Explanation:

Chlorine is in group 17 thus an extra electron increases it's size. Same is the case with sulphide ion but it is bigger than chloride because of extra spread of electron cloud.

K+ ion is smaller than both of the above because of accumulation of positive charge.

Smallest of all is Al because of it's considerably low atomic number.