The number of electrons in an element with atomic number X and mass number Y will be:

X - Y

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Y - X

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X + Y

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Solution

The correct option is C X
The number of electrons in an element with atomic number X and mass number Y will be X. It will be equal to the number of protons. The number of neutrons will be $Y - X$ .
Number of electrons $=$ number of protons $=$ atomic number.
Number of neutrons $=$ Mass number $-$ atomic number.

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