A) Actinoids have low I.E. and more reactive than lanthanoids.
B) 5f orbital is much more buried than 4/orbitals towards nucleus.
C) Mischmetal are called pyrophoric alloys, used in making lighter flints, contains lanthanoid metals along with \[Fe,\text{ }Al,\text{ }Mg\]etc.
D) The magnetic moment of Lanthanoids do not obey 'spin only' formula but is calculated by considering spin as well as orbital contribution.
Correct Answer: B
Solution :
[b] CORRECT statement: 4/orbital is much more buried
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