peppa45 peppa45
  • 20-09-2020
  • Chemistry
contestada

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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