The nucleus of a ²³₁₁Na atom contains

11 protons and 12 neutrons
11 protons and 12 electrons
23 protons and 11 neutrons
23 protons and 11 electrons

📝 Detailed explanation

The atomic number is 11, so there are 11 protons. The number of neutrons is 23 − 11 = 12.

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