na

Reading level: hard

Estimated CEFR level: C1 — Advanced

Estimated from word frequency; not an official CEFR classification.

Definition

  1. 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)

Etymology

From Middle English na, from Old English nā, from Old English ne (“not”) + ā (“ever”). More at no.

In classic literature

Synonyms

sodium, atomic number 11

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