potassium

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite

Coined by British chemist Humphry Davy in 1807, from potassa (a Latinized form of potash) + -ium.

Potassium nitrate, 75 parts; charcoal, 15 parts; sulphur, 10 parts. — Practical Mechanics for Boys, James Slough Zerbe
The best remedy is probably a solution of sulphuret of potassium. — Our Common Insects: A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses, A. S. (Alpheus Spring) Packard
I must have a course of shower-baths and of bromide of potassium. — Library of the World's Best Mystery and Detective Stories, Unknown

K, atomic number 19

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