ভৌত জগৎ ও পরিমাপ-১

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পরমাণুর সমস্ত ধন আধান এবং ভর এর কেন্দ্রে অবস্থিত - এই তত্ত্ব কে উপস্থাপন করেন ?
রাদারফোর্ড
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