WBCS.LIVE practice question

Mass number is always equal to ………

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. number of protons
  2. number of neutrons
  3. sum of number of protons and number of electrons
  4. sum of number of protons and number of neutrons

Correct answer and explanation

Correct answer: sum of number of protons and number of neutrons