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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

Text Solution

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The correct Answer is:
To solve the question, we need to identify the group of elements where the 4f orbitals are progressively filled. Here’s a step-by-step breakdown of the solution: ### Step 1: Understand the Question The question asks about the elements in which electrons are progressively filled in the 4f orbitals. **Hint:** Focus on the specific orbital mentioned (4f) and what it indicates about the type of elements. ### Step 2: Identify the Block of Elements Elements are categorized into different blocks based on their electron configuration. The 4f orbitals belong to the f-block of the periodic table. **Hint:** Recall that the f-block consists of two series of elements: lanthanoids and actinoids. ### Step 3: Determine the Series The f-block elements can be further divided into two series: - **Lanthanoids**: These are elements where the 4f orbitals are being filled. They range from atomic number 58 (Cerium) to 71 (Lutetium). - **Actinoids**: These are elements where the 5f orbitals are being filled. **Hint:** Remember that the filling of orbitals corresponds to the position of the elements in the periodic table. ### Step 4: Conclude the Answer Since the question specifically mentions the filling of 4f orbitals, the elements in which these orbitals are progressively filled are called **lanthanoids**. **Final Answer:** The elements in which electrons are progressively filled in 4f-orbitals are called **lanthanoids**. ---
To solve the question, we need to identify the group of elements where the 4f orbitals are progressively filled. Here’s a step-by-step breakdown of the solution: ### Step 1: Understand the Question The question asks about the elements in which electrons are progressively filled in the 4f orbitals. **Hint:** Focus on the specific orbital mentioned (4f) and what it indicates about the type of elements. ### Step 2: Identify the Block of Elements ...
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