defence exam Agniveer Army Tradesman Mock Test Series 2025 Chemistry Structure of Atom Atomic Structure

अणु सिद्धांत सर्वप्रथम कोणी मांडला?

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डेमोक्रिटस
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न्यूटन
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जॉन डाल्टन
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लाव्हॉइसियर
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