An atom $Y$ contains ten electrons and ten neutrons. State the number of protons it contains and its mass number.

10, 20

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10, 10

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20, 20

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20, 10

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Solution

The correct option is D $10, 20$
Atomic number = no. of electrons = no. of protons = $10$
Mass no. = no. of protons + no. of neutrons = $10 + 10 = 20$

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