Which of the following statement(s) is/are tr | vedclass

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(B) is true: According to the $(n+l)$ rule,if two orbitals have the same $(n+l)$ value,the one with the lower $n$ value has lower energy.$B$ is false:

Vedclass · Accepted Answer

$A$ and $C$ only

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(B) is true: According to the $(n+l)$ rule,if two orbitals have the same $(n+l)$ value,the one with the lower $n$ value has lower energy.$B$ is false: In a multi-electron atom,the energy of an orbital depends on the effective nuclear charge $(Z_{eff})$,not just the atomic number.$C$ is true: The size of an orbital increases as the principal quantum number $n$ increases. Since $n=2$ for $2p_x$ and $n=3$ for $3p_x$,$2p_x$ is smaller.$D$ is false: The number of radial nodes is given by the formula $(n-l-1)$.For $5f$: $5-3-1 = 1$ radial node.For $6s$: $6-0-1 = 5$ radial nodes.For $4d$: $4-2-1 = 1$ radial node.For $5p$: $5-1-1 = 3$ radial nodes.For $5d$: $5-2-1 = 2$ radial nodes.Since $5d$ has $2$ radial nodes,statement $D$ is incorrect.Therefore,only statements $A$ and $C$ are true.

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