Multiple choice general knowledge science & technology

The color of pure radium is

  1. Metallic White

  2. Steel Gray

  3. Brown

  4. Metallic Green
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A Correct answer
Explanation

Pure radium is a silvery-white alkaline earth metal with a characteristic metallic luster. The metal quickly tarnishes when exposed to air, forming a black surface layer of radium nitride, but in pure form it appears metallic white. Radium is radioactive and glows blue due to its ionization of surrounding air.

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