Which of the following is correct for sodium atom (Z = 11 and A = 23)?

12 neutrons, 12 protons

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11 electrons, 12 protons

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11 electrons, 12 neutrons

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11 neutrons, 12 electrons

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Solution

The correct option is C 11 electrons, 12 neutrons

Atomic number (Z) = Number of protons present in the nucleus of an atom

Hence, number of protons present in sodium atom = 11

For a neutral atom, number of electrons is equal to the number of protons.

Hence, number of electrons = 11

Mass number (A) = Number of neutrons + Number of protons

Number of neutrons
= Mass number - Number of protons
= 23-11 = 12
Hence, number of neutrons present in sodium atom = 12

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