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The Clue

Highly reactive metal (6 letter answer)

The Answer

CESIUM

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Notes

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

Related Clues

Element in photoelectric cells
Photoelectric cell component
Photoelectric cell element

Definition

CESIUM as a noun:

1. (cesium, caesium, Cs, atomic number 55) = a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal