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School Education Department, Government of West Bengal
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साहजिक कामाल चलाए का (? (नाला वाहिनी
गि निको अलि उल्ला कहा?
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Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass.
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ᴘʟᴢ ᴍᴀʀᴋ ᴍᴇ ʙʀᴀɪɴʟɪᴇꜱᴛ ᴘʟᴢ
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