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Question:

how to tell how many valence electrons an element has?

okay for example aluminum, the atomic mass/electrons is 26.98(or 27 rounded) how do i find out the valence electrons because im not sure how many electrons fit in a 3rd ring

Answer:

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If you're asking what I think you areThen the number of electrons in the 3rd ring is 8x] xxx Edit: 1st ring: 2 2nd ring: 8 3rd ring: 8 4th ring: 18 :)

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