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The number of Valence electrons in the groups 3 to 12 is variable, and depends on the element that it is being bonded with.

For example:

If Iron (Fe) is going to form a compound with Sodium (Na), the Fe will act as though it has 7 valence electrons (i.e. it is willing two accept the one Na Valence electron).

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What is the cas number for bauxite?

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