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The elements in which electrons are prog...

The elements in which electrons are progressively filled in 4f-orbitals are calleD: (A)Actinoids (B)Transition elements (C)Lanthanoids (D)halogens.

A

Actinoids

B

Transition elements

C

Lanthanoids

D

halogens.

Text Solution

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The correct Answer is:
To solve the question, we need to identify which group of elements has electrons that are progressively filled in the 4f-orbitals. ### Step-by-Step Solution: 1. **Understand the Question**: The question asks about the elements where electrons are progressively filled in the 4f-orbitals. 2. **Identify the Series**: The 4f-orbitals are filled in a specific series of elements in the periodic table. This series starts after the element Lanthanum (La). 3. **Determine the Correct Group**: The elements that have their electrons progressively filled in the 4f-orbitals are known as Lanthanoids (or Lanthanides). This series includes elements like Cerium (Ce), Neodymium (Nd), and others up to Lutetium (Lu). 4. **Eliminate Other Options**: - **Actinoids**: These elements fill the 5f-orbitals, not the 4f-orbitals. - **Transition Elements**: These elements are characterized by partially filled d-orbitals, not specifically related to the 4f-orbitals. - **Halogens**: These are elements in Group 17 of the periodic table and do not involve 4f-orbitals. 5. **Conclusion**: Since the elements that fill the 4f-orbitals are called Lanthanoids, the correct answer is (C) Lanthanoids. ### Final Answer: (C) Lanthanoids
To solve the question, we need to identify which group of elements has electrons that are progressively filled in the 4f-orbitals. ### Step-by-Step Solution: 1. **Understand the Question**: The question asks about the elements where electrons are progressively filled in the 4f-orbitals. 2. **Identify the Series**: The 4f-orbitals are filled in a specific series of elements in the periodic table. This series starts after the element Lanthanum (La). ...
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