Isoelectronic species have the same number of _________________.

Explanation

To solve the question "Isoelectronic species have the same number of ________________," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Isoelectronic Species**:
- Isoelectronic species are atoms or ions that have the same number of electrons. This means that despite having different numbers of protons and neutrons, they share an identical electron configuration.

2. **Identifying Examples**:
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