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মৌলের ক্ষুদ্রতম কণা যার মধ্যে ওই পদার্থের সমস্ত ধর্ম বজায় থাকে এবং যা রাসায়নিক বিক্রিয়ায় অংশগ্রহণ করে, তাকে পরমাণু বলে।
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মৌলের ক্ষুদ্রতম কণা যার মধ্যে ওই পদার্থের সমস্ত ধর্ম বজায় থাকে এবং যা রাসায়নিক বিক্রিয়ায় অংশগ্রহণ করে, তাকে পরমাণু বলে।