Formule 7 Atomen Helium. Its monatomic form (h) is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table.
It belongs to group 18, period 1, s block noble gas.
It is named after the greek word helios. Helium (vun't greeksch ἥλιος hélios „sünn) is en element mit dat atomteken he un de atomtall 2, dat jüst as neon, argon, krypton, xenon un radon en eddelgas is. 'sun') is a chemical element with the symbol he and atomic number 2. Helium is an element and this means it comprises only one type of atom, the helium atom.
No comments:
Post a Comment