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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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3 votes
3 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 Goseib
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2 Answers

10 votes
10 votes
b. 39 add the protons and the neutrons
User Zealseeker
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3.2k points
20 votes
20 votes
B. 39 ! Add the protons to the neutrons because they are the ones with mass in an atom.
User Diveintohacking
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3.2k points
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