The atomic weight of an element is $23$ and its atomic number is $11$ . The number of proton, electrons and neutrons respectively, present in the atom of the element are

11, 11, 12

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12, 12, 11

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11, 12, 11

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12, 11, 12

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Solution

The correct option is A $11, 11, 12$
The atomic weight of an element is 23 and its atomic number is 11. The number of proton, electrons and neutrons, present in the atom of the element are $11, 11, 12$ respectively

Number of electrons $=$ number of protons $=$ atomic number $= 11$
Number of neutrons $=$ Mass number $-$ atomic number $= 23 - 11 = 12$

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The atomic weight of an element is 23 and its atomic number is 11. The number of proton, electrons and neutrons respectively, present in the atom of the element are

The atomic weight of an element is $23$ and its atomic number is $11$ . The number of proton, electrons and neutrons respectively, present in the atom of the element are