No chemical compound of helium is known
Or Helium forms no real chemical compound.

Explanation

### Step-by-Step Solution:

1. **Understanding Helium's Electronic Configuration**:
- Helium has an electronic configuration of \(1s^2\). This means it has two electrons in its outermost shell, which is the only shell it has.

2. **Noble Gas Configuration**:
- Helium is a noble gas, and its \(1s^2\) configuration is very stable. Noble gases are known for their lack of reactivity due to their full valence shells.

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