What is the trend down the group in the periodic table of atomic size ?

Explanation

### Step-by-Step Solution:

1. **Understanding Atomic Size**:
Atomic size refers to the distance from the nucleus of an atom to the outermost shell of electrons. It can be measured in terms of atomic radius.

**Hint**: Remember that atomic size is related to the distance from the nucleus to the outermost electrons.

2. **Trend Down the Group**:
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