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Lanthanum is the first element of the la...

Lanthanum is the first element of the lanthanide series has

A

only 6s-orbital is filled

B

4d and 4f-orbitals are unfilled

C

3d and 5d-orbitals are unfilled

D

4f-and 5d-orbitals are filled

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The correct Answer is:
A
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