Lesson eLearning

An atom has mass number 12 and atomic number 6. How many protons does it have?

easy MCQ 1 mark Class 9 · Science · Atoms and Molecules
  1. 6
  2. 12
  3. 7
  4. 8
Answer
6

The correct answer is 6 — Hence, it has 6 protons.

Step-by-step solution

  1. The number of protons in an atom is given by the atomic number.
  2. The atom’s atomic number is 6.
  3. Hence, it has 6 protons.
Common mistake: Confusing mass number with atomic number

Concept tested: Atomic number and protons

Published · How this solution was prepared and checked

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