What is unified atomic mass unit? How is it related to mass number?
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ᴛʜᴇ ᴅᴀʟᴛᴏɴ ᴏʀ ᴜɴɪғɪᴇᴅ ᴀᴛᴏᴍɪᴄ ᴍᴀss ᴜɴɪᴛ (sʏᴍʙᴏʟs: ᴅᴀ ᴏʀ ᴜ) ɪs ᴀ ᴜɴɪᴛ ᴏғ ᴍᴀss ᴡɪᴅᴇʟʏ ᴜsᴇᴅ ɪɴ ᴘʜʏsɪᴄs ᴀɴᴅ ᴄʜᴇᴍɪsᴛʀʏ. ɪᴛ ɪs ᴅᴇғɪɴᴇᴅ ᴀs 1/12 ᴏғ ᴛʜᴇ ᴍᴀss ᴏғ ᴀɴ ᴜɴʙᴏᴜɴᴅ ɴᴇᴜᴛʀᴀʟ ᴀᴛᴏᴍ ᴏғ ᴄᴀʀʙᴏɴ-12 ɪɴ ɪᴛs ɴᴜᴄʟᴇᴀʀ ᴀɴᴅ ᴇʟᴇᴄᴛʀᴏɴɪᴄ ɢʀᴏᴜɴᴅ sᴛᴀᴛᴇ ᴀɴᴅ ᴀᴛ ʀᴇsᴛ
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Unified atomic mass unit(u) is defined as 1/12 of mass of a Carbon-12 atom. Atomic mass of any element is given as the relative mass of its atoms as compared with the mass of Carbon-12, taken as 12 units.
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