Chemistry
Grade-9
Easy

Question

How many electrons are in a potassium atom?

  1. 19
  2. 39
  3. 20
  4. 40

hintHint:

In a neutral atom number of protons and electrons are equal.

The correct answer is: 19


    • Atomic number = number of protons, atomic mass = number of protons + number of neutrons.
    • In a neutral atom number of protons and electrons are equal.
    • Atomic number of potassium is 19 and atomic mass is 39.08 which is almost equal to 39. Therefore, number of electrons is 19.

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