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MDCAT Chemistry QUESTION #4342
Question 1
Number of unpaired electrons in Boron ($B$) in ground state is/are:
  • 1✔️
  • 2
  • 3
  • 4
Correct Answer Explanation
Boron has atomic number 5. Its electronic configuration is $1s^2\ 2s^2\ 2p^1$. The single electron in the $2p$ orbital is unpaired, so there is $\mathbf{1}$ unpaired electron.