For the energy levels in an atom,which one of | vedclass

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(B) The correct statement is $(b)$. The second principal energy level $(n=2)$ consists of $2s$ and $2p$ subshells. The $2s$ subshell has $1$ orbital a

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The second principal energy level can have four sub-energy levels and contains a maximum of eight electrons

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(B) The correct statement is $(b)$. The second principal energy level $(n=2)$ consists of $2s$ and $2p$ subshells. The $2s$ subshell has $1$ orbital and the $2p$ subshell has $3$ orbitals,totaling $4$ orbitals. Each orbital can hold $2$ electrons,so the maximum capacity is $4 	imes 2 = 8$ electrons. Option $(a)$ is incorrect as there are theoretically infinite energy levels. Option $(c)$ is incorrect because the $M$ shell $(n=3)$ can hold $2n^2 = 2(3)^2 = 18$ electrons. Option $(d)$ is incorrect because according to the $(n+l)$ rule,$4s$ $(4+0=4)$ has lower energy than $3d$ $(3+2=5)$.

For the energy levels in an atom,which one of the following statements is correct?

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