How many protons (p) and neutrons (n) are in an atom of 
Ac?
A) 89 p, 138 n
B) 89 p, 227 n
C) 138 p, 89 n
D) 227 p, 89 n
Correct Answer:
Verified
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A) an atom that has
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A) gamma
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A) 25
B)
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