Pr (Noun)
Meaning 1
A promotion intended to create goodwill for a person or institution.
Classification
Nouns denoting communicative processes and contents.
Synonyms
Hypernyms
Meaning 2
A self-governing commonwealth associated with the United States occupying the island of Puerto Rico.
Classification
Nouns denoting spatial position.
Synonyms
Meaning 3
A soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process.
Classification
Nouns denoting substances.
Examples
- Praseodymium is used in the form of Pr3+ in some specialized color cathode-ray tubes and similar display phosphors.
- Although praseodymium is not particularly rare in the Earth's crust, the process of recovering this trivalent metal is too expensive.
- The chemical properties of praseodymium resemble those of lanthanum and cerium.
- Praseodymium belongs to the rare-earth metals and is used in the form of Pr3+ in some specialized color cathode-ray tubes.
- Separation of praseodymium from other rare-earth elements can be achieved by solvent extraction.