An atom 'X' has a mass number of 12 and contains 6 electrons. State the atomic number of 'X' and the number of neutrons it contains.

6, 6

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6, 12

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12, 6

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12, 12

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Solution

The correct option is A 6, 6
No. of protons = no. of electrons = 6 = Atomic number
Given that mass number = no. of protons + no. of neutrons = 12
Therefore no. of neutrons = 12 - 6 = 6

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