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Chapter 8 Journey Inside the Atom - Part 5

Which element has an atomic number of 1 and is the lightest element known?

Type: MCQ • Marks: 1
Which element has an atomic number of 1 and is the lightest element known?
Options
A. Carbon
B. Hydrogen
C. Helium
D. Lithium
Explanation
Hydrogen is the lightest element with atomic number 1.
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Class 9th Science (MCQ)

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