How to Tell Valence Electrons from Periodic Table
For elements in the d-block, things are a bit trickier. You'll need to consider the electron configurations, but generally, it's the electrons in the outermost s and d orbitals.
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Check the group number. The group number for the main-group elements (not the transition metals) corresponds to the number of valence electrons!
You can usually figure out the number of valence electrons by looking at the group number for elements in groups 1-2 and 13-18. For example, elements in Group 1 have 1 valence electron, Group 2 have 2, and Groups 13-18 have 3-8 valence electrons respectively!
Just look at the group number, dude. If it's in groups 1-2 or 13-18, the group number gives you the valence electrons. Easy peasy!
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