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Atomic Number 69 (Noun)

Meaning

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.

Classification

Nouns denoting substances.

Examples

  • Thulium, with the atomic number 69, is a chemical element that is the thirteenth and third-to-last element in the lanthanide series.
  • Thulium, with atomic number 69, is used in high-temperature superconductors, cancer treatments, and portable X-ray devices.
  • Atomic number 69, also known as thulium, is used in X-ray machines that are portable and do not require electricity.
  • The atomic number 69, or thulium, is one of the least abundant of the rare earth elements.
  • The atomic number 69 element, thulium, has a bright, silvery luster.

Synonyms

  • Thulium
  • Tm

Hypernyms

  • Metallic Element
  • Metal
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