11 grade chemistry others
How many valence electrons does helium have?
How many valence electrons does helium have?
1 Answer
Askiitians Tutor Team
Helium (He) has **2 valence electrons**. Here's why:
1. **Atomic Number of Helium**: Helium has an atomic number of 2, meaning it has 2 protons in its nucleus and 2 electrons surrounding the nucleus.
2. **Electron Configuration**: The electron configuration of helium is \( 1s^2 \). This means both of its electrons occupy the 1s orbital, which is the lowest energy level and the only orbital in the first shell.
3. **Valence Electrons**: Valence electrons are the electrons in the outermost shell of an atom. Since helium has only one shell (the first shell, 1s), its 2 electrons are in the outermost shell, making both of them valence electrons.
So, **helium has 2 valence electrons**.
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