Chemistry
Grade-9
Easy

Question

How many neutrons does fluorine have?

  1. 9
  2. 19
  3. 10
  4. 18

hintHint:

atomic mass = number of protons + number of neutrons.

The correct answer is: 10


    Atomic number = number of protons, atomic mass = number of protons + number of neutrons.
    Atomic number of fluorine is 9 and atomic mass is 18.998 which is almost equal to 19. Therefore, number of neutrons is 10.

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