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