What other elements may be added to silicon to make electrons available for conduction of an electric current?

Explanation

To determine what other elements may be added to silicon to make electrons available for conduction of an electric current, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Group of Silicon**:
- Silicon (Si) is located in Group 14 of the periodic table. Elements in this group have four valence electrons.

2. **Understand the Requirement for Conduction**:
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