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  4. In the nucleus of 11 Na 23, the number of protons, neutrons and electrons are

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Q. In the nucleus of ${ }_{11} Na ^{23}$, the number of protons, neutrons and electrons are

AIPMTAIPMT 1991Atoms

Solution:

$Z=11$ i.e., number of protons $=11, A=23$
$\therefore$ Number of neutrons $=A-Z=12$
Number of electron $=0$ (No electron in nucleus)
Therefore $11, 12, 0 .$