Mass Number Of Potassium
An atom of potassium has {eq}19 {/eq} protons and {eq}20 {/eq} neutrons. What is its mass number?
A
1
B
20
C
19
D
18
E
39
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clep.ai501(c)(3) Nonprofitclep.ai501(c)(3) NonprofitAn atom of potassium has {eq}19 {/eq} protons and {eq}20 {/eq} neutrons. What is its mass number?
1
20
19
18
39
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