Answer:
(c) Gadolinium (64) is
the seventh member of lanthanide series. Thus, it has 7 electrons on 4f-orbitals.
General electronic configuration
of lanthanide series is:
\[[Xe]4{{f}^{1-14}}5{{d}^{1}}6{{s}^{2}}\]
On this basis, the electronic
configuration of gadolinium is:
\[[Xe]4{{f}^{7}}5{{d}^{1}}6{{s}^{2}}\]
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