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  4. Which belongs to the actinide series?

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Q. Which belongs to the actinide series?

MGIMS WardhaMGIMS Wardha 2011

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.