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