state gov Bihar Police Constable (सिपाही) Mock Test Series 2025 General Science Chemistry Structure of Atom

हाइड्रोजन परमाणु की परमाणु त्रिज्या है:

1
10⁻¹⁰ m
2
10⁻⁷ m
3
10⁻⁸ m
4
10⁻⁹ m
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