The elements in a period have __________valencies. (same/different).

Explanation

To answer the question "The elements in a period have __________ valencies," we will analyze the properties of elements in a period.

### Step-by-Step Solution:

1. **Understanding Periods in the Periodic Table**:
- A period in the periodic table refers to a horizontal row of elements. Each period corresponds to the filling of a particular electron shell.

2. **Examining Valency**:
...