The elements in which electrons are progressively filled in 4f -orbital are called
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a
actinoids
b
transition elements
c
lanthanoids
d
halogens
answer is C.
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Detailed Solution
The elements in which electrons are progressively filled n 4 f-orbital are called lanthanoids. Lanthanoids consist of elements from Z = 58 (cerium) to 7l (lutetium).