sodium

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt)

Coined by British chemist Humphry Davy in 1808, from soda + -ium.

2: Water, 32 ounces; sodium sulphate. — Practical Mechanics for Boys, James Slough Zerbe
Hence you observe that sodium chloride is encountered there in significant proportions. — Twenty Thousand Leagues Under the Seas: An Underwater Tour of the World, Jules Verne
You see, then, that chloride of sodium forms a large part of it. — Twenty Thousand Leagues under the Sea, Jules Verne

Na, atomic number 11

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