In Niobium $(Z = 41)$,the number of electrons with $m = -1$ will be:

  • A
    $7$ or $8$
  • B
    $8$ or $9$
  • C
    $1$ or $2$
  • D
    $3$ or $4$

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Given below are two statements. One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$ : Energy of $2s$ orbital of hydrogen atom is greater than that of $2s$ orbital of lithium.
Reason $R$ : Energies of the orbitals in the same subshell decrease with increase in the atomic number.
In the light of the above statements,choose the correct answer from the options given below.

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