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if an element filled all three of its first electron energy levels, how many electrons would it have?

First three electron energy levels are 1s, 2s and 2p
and s can accommodate 2 electrons each and p can accommodate 6 electrons
Therefore total electrons = 2+2+6 = 10 i.e. Neon (Ne)

1st level is 2 2nd is 8 3rd is 18 so 28 all together