Question

H. Why the ground-state
ground-state electronic
configurations of gadolinium and
lawrentium are different than expected?​

Answer 1

Answer:

Gadolinium

Z=64

symbol:Gd

block : F block

period: 6 period

Electronic configuration

expected: [Xe]4f 8 6s 2

observed:[Xe]4f7 5d1 6s2

Reason: Half filled f orbital is more stable than partially filled f orbital and since energy difference is not much between 4f orbital and 5d orbital thus 1 electron from 4f orbital(expected to have 8e) jumps to 5d orbital making it 5d1 thus deviating from the expected configuration and conferring stability through hund’s rule of maximum multiplicity.

Answer 2

Answer:

Gadolinium

Z=64

symbol:Gd

block : F block

period: 6 period

Electronic configuration

expected: [Xe]4f 8 6s 2

observed:[Xe]4f7 5d1 6s2

Reason: Half filled f orbital is more stable than partially filled f orbital and since energy difference is not much between 4f orbital and 5d orbital thus 1 electron from 4f orbital(expected to have 8e) jumps to 5d orbital making it 5d1 thus deviating from the expected configuration and conferring stability through hund’s rule of maximum multiplicity.

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