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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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14y ago
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13y ago

Group 1 atoms have one valence electron

Group 2 has 2 valence electrons

Groups 3-12 depends on what atom its paired up with

Groups 13-18 take the group number and subtract it by 10

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9y ago

In groups 13-18, the last digit of group number determines valence electron. Example-Group-13 has 3 valence electrons.

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Q: What is the rule on finding valence electrons for groups 13-18?
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