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পারমাণবিক সংখ্যা (অর্থাৎ প্রোটন সংখ্যা) বা পরমাণু ক্রমাঙ্ক।
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পারমাণবিক সংখ্যা (অর্থাৎ প্রোটন সংখ্যা) বা পরমাণু ক্রমাঙ্ক।