How to Find the Valence Electrons on a Periodic Table
Check the group number for main-group elements (columns 1, 2, and 13-18). For example, elements in group 1 have 1 valence electron, while group 17 elements have 7.
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Just look at the group number! Group number = valence electrons, mostly. Easy peasy!
In my experience, simply knowing the group number gives you the valence electron count for most elements. Just remember, some exceptions like transition metals!
For transition metals, it's a bit trickier because they can have different valence electron counts. Consult a detailed chemistry resource or textbook for specifics.
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