Diatomic elements are pure elements that form molecules consisting of two atoms bonded together.

Hydrogen, nitrogen, oxygen, fluorine, chlorine, iodine, astatine and bromine.
When diatomic elements are converted to gaseous atoms, only half a mole of molecules will be needed, as the standard enthalpy change is based purely on the production of one mole of gaseous atoms.
by kaosmoker September 30, 2018
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