The mass number of a nucleus is X, while its atomic number is Y. What will be the number of neutrons and protons, respectively, in the nucleus?
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A.
(X + Y) and X
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B.
Y and (X − Y)
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C.
X and (X + Y)
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D.
(X − Y) and Y
Correct Answer:
D. (X − Y) and Y
Explanation:
The mass number (X) of an atom represent the total number of protons and neutrons in its nucleus, while the atomic number (Y) specifically denotes the number of protons. To find the number of neutrons, you subtract the atomic number from the mass number (X - Y). Therefore, in a nucleus with mass number X and atomic number Y, there are (X - Y) neutrons and Y protons.
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