Question:medium

How many electrons an atom have in M shell whose atomic number is 19?

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The number of electrons in a shell can be found using the electron configuration of an element.
Updated On: Jan 15, 2026
  • 6
  • 1
  • 8
  • 7
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The Correct Option is C

Solution and Explanation

The element Potassium (K) has an atomic number of 19. Its electron configuration is:\n\[\nK(19) = 2, 8, 8, 1\n\]\nTherefore, the M shell (third shell) has 8 electrons.
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