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Atomic number of sodium is 11 and its atomic mass is 23, so number of protons and neutrons in an atom of sodium is

$\begin{array}{1 1} A.11 \;and\;11 \\ B. 11 \;and\;23 \\ C. 23 \;and\;11 \\ D. 11 \;and\;12 \end{array} $

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