Valence electrons are the electrons in the outermost shell of an atom. Here’s how the elements you mentioned can be grouped based on the number of valence electrons they have:
- Carbon: 4 valence electrons
- Hydrogen: 1 valence electron
- Oxygen: 6 valence electrons
- Helium: 2 valence electrons
So, they can be matched based on their number of valence electrons as follows:
- Hydrogen: 1 valence electron
- Helium: 2 valence electrons
- Carbon: 4 valence electrons
- Oxygen: 6 valence electrons
Each element has a unique number of valence electrons, so there are no pairs among these elements with the same number of valence electrons.
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