Actinides are

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p- Block elements

Non metals

Non-radioactive elements

Radioactive elements

answer is D.

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Detailed Solution

Actinides are radioactive elements.

The protons to neutrons ratio in the actinides cause the instability of their atomic nuclei. This results in the expulsion of some kind of particle (alpha or beta) from those nuclei, which results in a transmutation into a different, less massive (and typically more stable) element. It's radioactive decay.

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