An atom contains eleven protons. State its atomic number and the number of electrons it contains.

12, 12

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12, 11

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11, 11

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12, 13

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Solution

The correct option is B 11, 11
As we know, atomic no. of an atom is total no. of proton (p) present in nucleus of atom and every neutral atom has same no. of proton and electron. Mass no. of an atom is total no of neutron and proton (n+p) present in nucleus of atom. So, X has atomic no. 11 and it has 11 electrons.

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