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In the nucleus of ^23_11Na, the number of protons, neutrons and electrons are

1. 11, 12, 0
2. 23, 12, 11
3. 12, 11, 0
4. 23, 11, 12

Correct answer: 11, 12, 0

Solution

The atomic number (11) represents the number of protons, and the mass number (23) minus the atomic number gives the number of neutrons (23 - 11 = 12). Electrons are not present in the nucleus.

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