Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Electronic configuration of 
is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
The expected electronic configuration of Cu (29) is 
but actually it is found to be 
. This is because fully filled d orbitals are more stable than incompletely filled d -orbitals. So there is a migration of one 
, from 4 s orbital to 3 d orbital to give a more stable configuration.
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