Crossword puzzle clue "element used in atomic clocks"

Here are the possible solutions for element used in atomic clocks clue

Answer
Clue
Relevancy
cesium
Clue
Element used in atomic clocks
Element in atomic clocks
Atomic clock element
Definition
a metallic element
barium
Clue
Metallic element with atomic number 28
Definition
a metallic element
betadecay
Clue
Process by which an element's atomic number may be reduced, and a hint to this puzzle's theme
boron
Clue
Element with atomic number 5
Element with a low atomic number that is not found naturally on Earth
Definition
a relatively inert nonmetallic chemical element
hydrogen
Clue
Chemical element with atomic no. 1 in the periodic table
Definition
a gaseous element

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