ᴅᴇꜰɪɴᴇ ʜyᴅʀᴏɢᴇɴ..
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hydrogen (h) ,a colourless,odourless,tasteless, flammable gaseous substance that is the simplest member of the family of chemical elements under ordinary conditions, hydrogen gas is a loose aggregation of hydrogen molecules each consisting of a pair of atoms , diatomic molecules H2.
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