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Question
The elements in which electrons are progressively filled in 4f-orbital are called ______.
Options
actinoids
transition elements
lanthanoids
halogens
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Solution
The elements in which electrons are progressively filled in 4f-orbital are called lanthanoids.
Explanation:
The lanthanides which belong to the f-block elements are the elements where 4f-orbitals are filled progressively.
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