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To which group and period respectively does an element with 15 electrons belong?

Chemistry
WAEC 2015

To which group and period respectively does an element with 15 electrons belong?

  • A. 3 and 3
  • B. 3 and 5
  • C. 5 and 3
  • D. 5 and 5
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Correct Answer: Option C
Explanation

An element with 15 electrons is Phosphorus (P), which belongs to Group 5 and Period 3, as its electron configuration ends in, showing 5 valence electrons in the third shell. 

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