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5 February, 20:43

What is the name of the element with a valence electron configuration of 4s^2

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  1. 5 February, 20:55
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    It is in period 4 bc it has a 4 in 4s2. Look at last element in that period. It is Krypton (36). The extra 2 electrons are from 4s^2. Add 36 + 2 to get 38, or Strontium.
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