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. Boron
  2. Carbon
  3. Nitrogen
  4. Lithium

hintHint:

Atomic mass = number of protons + number of protons.

The correct answer is: Carbon


    • Atomic number = number of protons and atomic mass = number of protons + number of protons.
    • Atomic number of the element is 23 and an atomic mass of 50.89 which is almost equal to 51.
    • Number of neutrons in the element is 28.