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Question

The number of electrons in a neutral atom with atomic number X and mass number Y is ________.

A
X - Y
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B
Y - X
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C
X + Y
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D
X
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Solution

The correct option is D X
Atomic number is the number of protons in the nucleus of an atom.
For a neutral atom, the number of protons is equal to the number of electrons.
Hence, number of electrons = number of protons = atomic number = X

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