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.