Atomic size decreases in a ___________of the periodic table as the atomic number increases from left to right. (group/period)

Explanation

To answer the question, "Atomic size decreases in a ___________ of the periodic table as the atomic number increases from left to right. (group/period)", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- A **period** is a horizontal row in the periodic table.
- A **group** is a vertical column in the periodic table.

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