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The Structure of Potassium Atom

CHEM-DMJGAN

The atomic number of potassium is 19 and mass number (or atomic weight) of the most abundant potassium isotope is 39 AMU (atomic mass unit).

How many protons, neutrons and electrons are there in one neutral atom of this potassium isotope, respectively?

A

20, 19, and 20, respectively.

B

19, 20, and 19, respectively.

C

19, 19, and 20, respectively.

D

19, 19, and 19, respectively.