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The atomic radius of a hydrogen atom is about:

A37 pm
B27 pm
C47 pm
D57 pm
Answer & Solution
Correct answer: A. 37 pm
1. Atomic radii are measured in picometres. 2. Hydrogen is the smallest atom. 3. Its radius is 37 pm. _Source: syllabus Science Class X, Chapter 5, Periodic Classification of Elements._
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