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An atom of potassium has 19 protons and 20 neutrons. What is its mass number? Select one: a. 20 b. 39 c. 19 d. 10
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20 votes
An atom of potassium has 19 protons and 20 neutrons. What is its mass number? Select one:

a. 20
b. 39
c. 19
d. 10

User Patrick Burns
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2 Answers

12 votes
b. 39 add the protons and the neutrons
User Gianina
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4.4k points
7 votes
B. 39 ! Add the protons to the neutrons because they are the ones with mass in an atom.
User Todd Berman
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4.8k points
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