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All the lanthanoids and actinoids belong...

All the lanthanoids and actinoids belong to period of

A

5th and 6th respectively

B

6th and 7th respectively

C

5th and 7th respectively

D

either (1)(2)

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To determine the periods to which all the lanthanoids and actinoids belong, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Periodic Table Structure**: - The modern periodic table is organized into periods (horizontal rows) and groups (vertical columns). There are 7 periods in total in the modern periodic table. 2. **Identifying Lanthanoids and Actinoids**: - Lanthanoids are a series of 15 elements from Lanthanum (La, atomic number 57) to Lutetium (Lu, atomic number 71). - Actinoids are a series of 15 elements from Actinium (Ac, atomic number 89) to Lawrencium (Lr, atomic number 103). 3. **Locating Lanthanoids in the Periodic Table**: - Lanthanoids are found in the sixth period of the periodic table. They are placed in the f-block, which is located below the main body of the periodic table. 4. **Locating Actinoids in the Periodic Table**: - Actinoids are found in the seventh period of the periodic table. Similar to lanthanoids, they are also placed in the f-block. 5. **Conclusion**: - Therefore, all lanthanoids belong to the sixth period, and all actinoids belong to the seventh period of the periodic table. ### Final Answer: All the lanthanoids belong to the **6th period**, and all the actinoids belong to the **7th period** of the periodic table. ---
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Knowledge Check

  • The lanthanoids and actinoids are sometimes called f -block transition elements because they have incompleted filled _______ f -subshells.

    A
    penultimate
    B
    ultimate
    C
    inner
    D
    antepenultimate
  • In the periodic table actinons belong to

    A
    6th period group 4
    B
    6th period group 3
    C
    7th period group 3
    D
    7th period group 4
  • Gymnosperms belong to the period

    A
    Jurassic
    B
    Crustaceous
    C
    Triassic
    D
    None of these
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