Which of the following is not an actinoi...

Which of the following is not an actinoid ?

Curium (Z =96 )

Californium (Z=98)

Uranium ( Z= 92)

Terbium (Z=65)

Verified by Experts

The correct Answer is:

Elements with atomic numbers `Z=90 -103 are called actinoids. Therefore terbium (Z= 65) is not an actinoid .Thus option ( d) is correct.

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General electronic configuration of actinoids is (n-2)f^(1-14)(n-1)d^(0-2)ns^(2) . Which of the following actinoids have one electron in 6d orbital?

U (Atomic number. 92)

Np (Atomic number. 93)

Pu (Atomic number. 94)

Am (Atomic number. 95)

U ( Atomic no. 92)

Np ( Atomic no . 93)

Pu ( Atomic no. 94)

Am ( Atomic no. 95)

Actinoids show variable oxidation states due to the availability of 5f, 6d and 7s-orbitals.

Np and Pu exhibit `+7`oxidation state.

Nobelium is very stable in `+2` oxidation state due to `f^7`configuration.

When the oxidation number increases to `+6`, the actinoid ions form oxygenated ions.