Atomic and Mass Number Learning App | Class 9 Chemistry MCQs e-Book PDF
Class 9 Chemistry MCQs (Grade 9) From Textbook

Class 9 Chemistry MCQs – Certification Test 18

Atomic and Mass Number MCQs (Question 18) – App & e-Book Download

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MCQ 18: The mass number of an atom is:

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

Atomic and Mass Number MCQs App & e-Book – Class 9 Chemistry Learning Guide

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