In a period if the atomic radius of the first element is 152 pm, what is the atomic radius of the third element-more than or less than 152 pm?

Explanation

To solve the question regarding the atomic radius of the third element in a period, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Given Information**:
- The atomic radius of the first element in a period is given as 152 picometers (pm).

2. **Understand the Trend in Atomic Radius Across a Period**:
...