Sodium Meaning
/ˈsəʊ.dɪəm/Definition, CEFR level B2, pronunciation, examples, and quiz.
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Definition
nounThe chemical element (symbol Na) with an atomic number of 11 and atomic weight of 22.990. It is a soft, waxy, silvery, reactive alkali metal that is never found unbound in nature.
nounEmploying sodium.
Sentence Examples
Sodium reacts vigorously and exothermically with water.
Lithium, sodium, potassium, rubidium, caesium and francium are alkali metals.
CEFR Practice Quiz
The chemical symbol Na stands for ____, a metal found in common table salt.
CEFR Practice Quiz (Alternate)
Common table salt is primarily composed of ____ and chloride, and is used everywhere in cooking.
Word Origin & History
Coined by British chemist Humphry Davy in 1808, from soda + -ium.
Literary Quotations & Historical Citations
"From Keighley onwards we had obviously returned to civilisation, for the surrounding country was now studded with the sodium street lights of suburbia and a thickening industrial haze was blotting out the moon."
— 1960 January, G. Freeman Allen, “"Condor"—British Railways' fastest freight train”, in Trains Illustrated, page 48:
Explore More B2 Vocabulary Words
CEFR Practice Quiz
The chemical symbol Na stands for ____, a metal found in common table salt.
CEFR Practice Quiz (Alternate)
Common table salt is primarily composed of ____ and chloride, and is used everywhere in cooking.