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Metals and Non-Metals — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMetals and Non-Metals1 Mark
Question
The noble gas having only two electrons in its valence shell is:
  1. Ar
  2. Ne
  3. He
  4. Kr
✓

Answer

  1. He

Explanation:

Atomic number of helium is 2. It contains 2 electrons in its atom.

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