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2. structure of atom — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
The quantum number/s needed to describe an electron fully in an atom is/are:
  • A
    $1$
  • B
    $2$
  • C
    $3$
  • ✓
    $4$
✓

Answer

Correct option: D.
$4$
d
The number of quantum numbers needed to completely define an electron in the orbit of an atom is $4 .$

Thus all the four quantum numbers $n , l , m$ and $n$ are required. This is in accordance with Pauli's exclusion principle according to which, no two electrons in an atom can have the same set of four quantum numbers.

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