Atomic Number 21 (Noun)
Meaning
A white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite.
Classification
Nouns denoting substances.
Examples
- Scandium, also known as atomic number 21, is a silvery-white transition metal.
- The periodic table identifies the atomic number 21 as scandium, a relatively soft and corrosion-resistant element.
- Thortveitite, a rare Scandinavian mineral, contains small amounts of atomic number 21.
- Researchers discovered that atomic number 21 exhibits some properties of both metals and nonmetals.
- Atomic number 21 is a trivalent element that reacts with air and water, making it highly reactive.