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Chem Chemistry

ChemistryNEB 2074 (old course) (grade increment)

Name the quantum number that specifies the energy of an electron in an atom. What designation is given to an orbital having n=3 and l=2

2

Answer

· Based on the official syllabus and past papers
Updated

The quantum number that specifies the principal energy of an electron in an atom is the principal quantum number (n). It determines the size and energy level of the orbital and can take any positive integer value (n = 1, 2, 3, ...).

For an orbital with n = 3 and azimuthal quantum number (l) = 2, the designation is a 3d orbital. This is because:

  • n = 3 indicates the third energy level (shell).
  • l = 2 corresponds to the d-subshell (where l = 0 → s, l = 1 → p, l = 2 → d, l = 3 → f).

Thus, the orbital is labeled as 3d, which can hold a maximum of 10 electrons (5 orbitals × 2 electrons each).

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