Write on the electropositivity of iodine.

Explanation

### Step-by-Step Solution:

1. **Identify the Group and Nature of Iodine**:
- Iodine is a member of Group 17 in the periodic table, which is known as the halogens. It is classified as a nonmetal.

2. **Understand Atomic Size and Effective Nuclear Charge**:
- As we move down the group in the periodic table, the size of the atoms increases. This increase in atomic size is due to the addition of electron shells.
- Along with the increase in size, the effective nuclear charge (the net positive charge experienced by electrons) experienced by the outermost electrons decreases.
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