Define atomic mass and unified mass
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The unified atomic mass unit (symbol: u) or dalton (symbol: Da) is the standard unit that is used for indicating mass on an atomic or molecular scale (atomic mass). One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol.
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ᴛʜᴇ ᴍᴀss ᴏғ ᴀɴ ᴀᴛᴏᴍ ᴏғ ᴀ ᴄʜᴇᴍɪᴄᴀʟ ᴇʟᴇᴍᴇɴᴛ ᴇxᴘʀᴇssᴇᴅ ɪɴ ᴀᴛᴏᴍɪᴄ ᴍᴀss ᴜɴɪᴛs. ɪᴛ ɪs ᴀᴘᴘʀᴏxɪᴍᴀᴛᴇʟʏ ᴇϙᴜɪᴠᴀʟᴇɴᴛ ᴛᴏ ᴛʜᴇ ɴᴜᴍʙᴇʀ ᴏғ ᴘʀᴏᴛᴏɴs ᴀɴᴅ ɴᴇᴜᴛʀᴏɴs ɪɴ ᴛʜᴇ ᴀᴛᴏᴍ (ᴛʜᴇ ᴍᴀss ɴᴜᴍʙᴇʀ) ᴏʀ ᴛᴏ ᴛʜᴇ ᴀᴠᴇʀᴀɢᴇ ɴᴜᴍʙᴇʀ ᴀʟʟᴏᴡɪɴɢ ғᴏʀ ᴛʜᴇ ʀᴇʟᴀᴛɪᴠᴇ ᴀʙᴜɴᴅᴀɴᴄᴇs ᴏғ ᴅɪғғᴇʀᴇɴᴛ ɪsᴏᴛᴏᴘᴇs
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