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Which of the following sets of quantum numbers is not allowed?

The configuration $1s^2 2s^2 2p^5 3s^1$ shows

Match List-$I$ with List-$II$ :
List-$I$ (Quantum number)List-$II$ (Orbital)
$a. n=2, \ell=1$$i. 2s$
$b. n=3, \ell=2$$ii. 3s$
$c. n=3, \ell=0$$iii. 2p$
$d. n=2, \ell=0$$iv. 3d$

Choose the correct answer from the options given below :

Which rule describes the arrangement of electrons in subshells of the same energy?

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What will be the maximum number of electrons in any atom having quantum numbers $n = 4, l = 2, m = -2$?

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