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  9. Q41

BPSC (Bihar PCS) 2019 · Question 41 of 148

The number of electrons and neutrons in an element is 18 and 20 respectively. Its mass number is

Miscellaneous

  1. A22
  2. B2
  3. C38Correct
  4. D20
  5. ENone of the above/More than one of the above

Answer: C. 38

Explanation

Mass number = protons + neutrons = electrons + neutrons = 18 + 20 = 38; per key option C.

Source: Jagranjosh

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