Multiple choice general knowledge science & technology

Which one of them is a rare gas?

  1. Lithium

  2. Lanthanum

  3. Zirconium

  4. helium
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D Correct answer
Explanation

Helium is a rare gas (noble gas) - Group 18 elements known for being chemically inert due to their complete valence electron shells. Lithium is an alkali metal (Group 1), lanthanum is a lanthanide, and zirconium is a transition metal. Rare gases are called 'rare' because they exist in trace amounts in Earth's atmosphere.

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