A) \[Ce\]
B) \[Cf\]
C) \[Ca\]
D) \[Cs\]
Correct Answer: B
Solution :
The fourteen elements which follow actinium from thorium\[(Z=90)\]to lawrencium \[(Z=103)\]are called actinoids. They involve the filling of \[5f-\]subshell. Californium\[(Cf)\]has the atomic number 98 and its configuration is as\[Cf(Z=98):[Rn]5{{f}^{10}},\text{ }6{{d}^{0}},7{{s}^{2}}\]Hence, it is a member of actinide series.
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