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An Intiative by Sri Chaitanya
a
The 4th period in the periodic table ends at krypton with the filling up of the 3p-orbitals
b
The 5th period in the periodic table contains the 4d-transition series
c
Starting element of 4d-transition series is yttrium
d
Filling up of the 4f-orbitals begins with cerium
answer is A.
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