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  4. Which belongs to the actinides series?

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Q. Which belongs to the actinides series?

J & K CETJ & K CET 2005

Solution:

The fourteen elements which follow actinium from thorium $(Z=90)$ to lawrencium $(Z=103)$ are called actinoids.
They involve the filling of $5 f-$ subshell.
Californium $(C f)$ has the atomic number $98$ and its configuration is as
$C f(Z=98):[R n] 5 f^{10}, 6 d^{0}, 7 s^{2}$
Hence, it is a member of actinides series.