Moderate

According to Hund's rule an element with atomic number 15 will have unpaired electron:

Correct answer: D. 3 in p-subshell

  • A. 8 in d subshell
  • B. 2 in d subshell
  • C. 6 in p subshell
  • D. 3 in p-subshell

Explanation

The orbital diagram of the element with atomic number 15 is shown below which shows that it has 3 free electrons in p subshell.

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Atomic structure covers the discovery of the proton, Planck's quantum theory, hydrogen emission spectra and the evidence for quantized energy levels. You will use quantum numbers to describe orbitals, distinguish s, p, d and f orbital shapes, and write electronic configurations, including the correct order of electron filling.

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