peppa45 peppa45

20-09-2020
Chemistry

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Which element has 2 valence electrons and is in period 4?
A. Sodium B. Carbon C. Beryllium D. Calcium

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graceszalkie graceszalkie

20-09-2020

The correct answer is calcium. We know this because if we look at the periodic table calcium is the only option in period 4.

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