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Valence electrons are the electrons present in the outermost shell of an atom.

You can easily determine the number of valence electrons an atom can have by looking at its Group in the Periodic Table.

For example, atoms in Groups 1 and 2 have 1 and 2 valence electrons, respectively.

Atoms in Groups 13 and 18 have 3 and 8 valence electrons, respectively.

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How many valence electrons do alkaline earth metals have?

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