Question

in addition to uranium which other actinoid occurs naturally in significant amounts​

Answer 1

Answer:

Actinium, thorium, protactinium, and uranium are the only actinoid elements found in nature to any significant extent.

Answer 2

d) Thorium

Explanation:

• Actinoids are 15 consecutive chemical elements in the periodic table from actinium to lawrencium.
• They are significantly large because of their radioactivity. Although several members of the group, including uranium, occur naturally, most are man-made.
• Thorium and uranium are the most abundant actinoids in nature.
• Uranium mostly occurs in the earth’s crust as a mixture of oxides in the minerals uraninite also known as pitchblende because of its black color.
• Actinium is mostly present in uranium-containing, but also in other minerals, though in much smaller quantity.
• Plutonium is used in atomic weapons because of its explosive power and it is currently being employed in nuclear plants for the production of electrical power.

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