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The d & f Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
MCQ
The first and last elements of actinides are:
  • A
    Actinium and Thorium.
  • B
    Actinium and Nobelium.
  • C
    Actinium and Mendelevium.
  • ✓
    Actinium and Lawrencium.
✓

Answer

Correct option: D.
Actinium and Lawrencium.
We have $15$ elements in actinides. They are from atomic number $89$ to $103$ Actinium, Thorium, Protactinium, Uranium, Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium, Lawrencium. Hence, from these list we could say that Actinium is the first and Lawrencium is the last element in actinides.

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