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atomic number 69 meaning and definition

Definition and meaning of atomic number 69 at MeaningMonkey.org. atomic number 69 meaning and definition in the English Dictionary.

ATOMIC NUMBER 69 noun

Definition of atomic number 69 (noun)

  1. a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime
Source: Princeton University Wordnet
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