Power Thesaurus 1969, governess thesaurus, Power Thesaurus, viewed 2 September, 2017, <http://www.powerthesaurus.org/governess/synonyms>.
The noble gases have weak interatomic force, and consequently have very low melting and boiling points. They are all monatomic gases under standard conditions, including the elements with larger atomic masses than many normally solid elements.
As noble gases are mostly stable in unimolecular form, they doesn't react with much other compounds, thus its actually becomes difficult to find one in surroundings. Noble gases are inert gases. They don't easily react and thus, their compounds are rare. Plus, they are trace elements.