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ObjectiveMcq
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What is the full form of "Ac"?
Correct Answer: B — Actinium
Explanation:
Actinium (Ac) is a silvery radioactive metallic element. Actinium glows in the dark due to its intense radioactivity with a blue light. Actinium was discovered in 1899 by Andre-Louis Debierne, a French chemist, who separated it from pitchblende. Friedrich Otto Giesel independently discovered actinium in 1902.