Chemistry
Grade-8
Easy

Question

The atomic mass of an atom that has 12 protons, 12 electrons and 12 neutrons is:

  1. 36
  2. 24
  3. 12
  4. 40

hintHint:

Atomic mass in the mass of the nucleus.

The correct answer is: 24


    The atomic mass = sum of protons and neutrons
    =12+12
    =24u 
    The atomic mass of an element is the average mass of the element's atoms measured in atomic mass units (amu, aka Daltons, D).

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