ICSE Class 8 Chemistry Question 3 of 23

Atomic Structure — Question 7

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7
Question

Question 4d

If the atomic number of an atom is 17 and mass number is 35, then number of neutrons will be

  1. 35
  2. 17
  3. 18
  4. 52
Answer

18

Reason — Number of neutrons = Mass number - Atomic number = 35-17 = 18.
So, number of neutrons = 18.