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ChemistryChemistry
2 May, 16:59

Helium is considered a noble gas because it has a ___ valence electron shell.

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Answers (2)
  1. 2 May, 17:50
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    Two valence electron Shell or it could be zero because it do not react.
  2. 2 May, 19:32
    0
    Complete.

    Explanation:

    The noble gases are stable and do not generally react with other chemicals.

    Electron configuration of helium is 1s2.

    The inner electron shell 1s is complete (stable) when containing 2 electrons
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