What is the most stable monatomic ion formed from iodine?

The most stable monoatomic ion formed will be

Explanation:

Monoatomic ion is defined as the ion which contains only one atom.

Iodine gas is the 53rd element of the periodic table having 53 electrons.

The electronic configuration of this element is:

This element will easily gain 1 electron to attain stable electronic configuration and hence will carry a negative charge.

The ion formed when iodine atom gains 1 electron is iodine ion and is written as .The ion formed is an anion.

Hence, the most stable monoatomic ion formed will be

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.