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प्रश्न
An atom \begin{array}{l} {}^{23}\mathrm{A} \end{array} has 11 electrons. Find the number of neutrons in it.
अति संक्षिप्त उत्तर
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उत्तर
The atom has 11 electrons, so a neutral atom has 11 protons. Its mass number is 23. Therefore, the number of neutrons is 23 − 11 = 12.
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