science
Grade-9
Easy

Question

Which of the following is correct to find the number of neutrons?

  1. n= A-Z
  2. n + z=A
  3. Z= A-n
  4. All the above

hintHint:

The number of neutrons in an atom can be calculated by subtracting the atomic number from the atomic mass. Both of these numbers can be found on the periodic table.

The correct answer is: All the above


    Number of Protons = Atomic Number
    Number of Neutrons = Atomic Mass- Atomic Number
    Number of Electrons = Atomic Number

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