Quiz 6 Problem 6.69 Part& Constants I Periodic Table either configuration violat

Question

Quiz 6 Problem 6.69 Part& Constants I Periodic Table either configuration violate the Pauli exclusion principle? O Yes, configuration A violates the Pauli exc O No. both configurations follow the Pauli exclusion principle. Does Two possible electron configurations for an Li atom are shown here n principle Configuration A Yes. both configurations violate the Pauli exclusion principle O Yes, configuration B violates the Pauli exclusion principle 1s2s Submit t Answ Configuration E Part B Does either configuration violate Hund 's rule? ration A violates Hund's rule urations violate H rule ratio und's ure ru

Explanation / Answer

3 Li = 1s2 2s1

both the electronic configurations follow paulis exclusion principle, that is an orbital can accommodate only two electrons with different quantum numbers ( here opposite spin quantum numbers; +1/2 and -1/2).

now checking its validity with Hund’s rule of maximum multiplicity?

Hunds rule says that pairing of electrons will occur only after filling each electrons in degenerate orbitals ( having similar energy). Here 1s and 2s are not degenerate energy levels, so first electron will fill in 1s then move into 2s.

So both configuration obeys hund’s Rule of maximum multiplicity

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