atomic_number_18 (HyperDic hyper-dictionary) (English)

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English 1 sense of the expression *atomic number 18*:
NOUN	substance	atomic number 18, argon, Ar	a colorless and odorless inert gas

Englishatomic number 18: 1 sense noun 1, substance
Meaning	A colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere.
Synonyms	argon, Ar
Broader	chemical element, element	Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
Broader	noble gas, inert gas, argonon	Any of the chemically inert gaseous elements of the helium group in the periodic table
Substance of	air	A mixture of gases (especially oxygen) required for breathing
Spanish	argón, Ar, número atómico 18
Catalan	argó, número atòmic 18

HyperDicEnglishATOMIC NUMBER 1 ... atomic number 18