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The Clue

Element that quickly oxidizes in air (6 letter answer)

The Answer

BARIUM

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Notes

The answer BARIUM is so rare that it appears less than once every 2500 puzzles.

Related Clues

Metal in witherite
Whitish metal

Definition

BARIUM as a noun:

1. (barium, Ba, atomic number 56) = a soft silvery metallic element of the alkali earth group; found in barite