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Structure of the Atom — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
Question
All atoms contain neutrons in their nuclei except:
✓

Answer

  1. Protium
Explanation:
All atoms except Protium, an isotope of Hydrogen contain neutrons in their nuclei.
As Protium has zero neutrons in the nucleus and has mass no 1.

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