Potassium has a mass number of 40 and an atomic number of 19. How many protons does it have? A.59 B.21 C.19 D.40

asked Feb 23, 2019 223k views

1 vote

Potassium has a mass number of 40 and an atomic number of 19. How many protons does it have?

A.59
B.21
C.19
D.40

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1 vote

The answer is c. 19

The atomic number always represents number of protons

Jay Imerman answered Feb 24, 2019

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7 votes

The answer is C.
Potassium-40 or any type of potassium always has an atomic number 19 and 19 protons.

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