Chemistry
Grade-9
Easy

Question

If an element has an atomic number of 23 and an atomic mass of 50.89, how many neutrons must it have in its nucleus?

  1. 38
  2. 28
  3. 17
  4. 29

hintHint:

Atomic mass = number of proton + number of neutron

The correct answer is: 28


    • Atomic number =number of protons.
    • Atomic mass = number of proton + number of neutron.
    • Atomic number is 23, atomic mass is 50.89.
    therefore number of neutron = 28.

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