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How do I tell the number of Valence electrons present in an element just by looking at a periodic table?

I have a question on my test that deals with this, but I don't know what to do in order to find this out. Any help is appreciated! I can post the question, if that would help your explanation.

How do I tell the number of Valence electrons present in an element just by looking at a periodic table I have a question on my test that deals with this but I class=

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Look at the periodic table (Boron has 3) and count up from there

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