The first and last elements of actinides are:

Actinium and Thorium

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Actinium and Nobelium

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Actinium and Mendelevium

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Actinium and Lawrencium

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Solution

The correct option is 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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