Question

how many gases in morden periodc table ??

Answer 1

The noble gases; helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Ra) and element 118 (Uuo) occupy the rightmost group of the periodic table. Noble gases were also known as 'inert gases' and 'rare gases'; both these terms are now known not to be strictly correct. Some noble gases have been shown capable of forming compounds mainly with fluorine. Argon and helium can not be considered rare as argon makes up about 1% of our atmosphere and helium is the second most abundant element in the known universe.

The extremely low chemical reactivity of the noble gases is due them having a "complete valence shell". They tend not to gain or lose electrons. The noble gases have high ionisation energies and negligible electro negativities. The noble gases have very weak inter-atomic forces of attraction and very low melting points and boiling points. Noble gases are mono atomic gases under normal conditions, even those with larger atomic masses than many normally solid elements.

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Answer 2

The gaseous element group: H hydrogen, Ne neon, Ar argon, Kr krypton, Xe xenon, Rn radon, Og oganneson

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