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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
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

User Gforcada
by
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2 Answers

1 vote
The answer is c. 19


The atomic number always represents number of protons
User Jay Imerman
by
5.1k points
7 votes
The answer is C.
Potassium-40 or any type of potassium always has an atomic number 19 and 19 protons.
User Daniel Harding
by
4.6k points
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