The electronic configuration of an element is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^1$. This represents:

  • A
    Excited state
  • B
    Ground state
  • C
    Cation
  • D
    Anion

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An atom has $35$ nucleons and an atomic number equal to $17$. The number of electrons with $n = 2$ and $m = 0$ in it is:

The allowed set of quantum numbers for an electron in a hydrogen atom is

The four quantum numbers for the valence shell electron or last electron of sodium $(Z = 11)$ are:

Degenerate atomic orbitals have

For a one-electron atom,the set of allowed quantum numbers is

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