If the value of $(n+\ell)$ is not greater than $3$,which of the following subshells is not possible $-$

  • A
    $2s$
  • B
    $3s$
  • C
    $3p$
  • D
    $2p$

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Which one of the statements regarding quantum numbers is false?

For which of the following orbitals is the value of $(n + l)$ maximum?

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In a multi-electron atom,which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields?
$1. n = 1, l = 0, m = 0$
$2. n = 2, l = 0, m = 0$
$3. n = 2, l = 1, m = 1$
$4. n = 3, l = 2, m = 0$
$5. n = 3, l = 2, m = 0$

In the sixth period,the orbitals that are filled are

For azimuthal quantum number $l = 3$,the maximum number of electrons will be

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