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 \[Cf(Z=98):[Rn]\,5{{f}^{10}},6{{d}^{0}},7{{s}^{2}}\] Hence, it is a member of actinides series.
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