atomic number 5
Definition
Noun: 1. The chemical element Boron: A trivalent metalloid element with the symbol B and atomic number 5. It occurs in nature both as a hard, black crystalline solid and as a brown or yellow amorphous powder.
Usage
- Atomic number 5 is the definitive identifier for the element boron on the periodic table. It specifies the number of protons in the nucleus of a boron atom.
- This term is primarily used in scientific, technical, and educational contexts related to chemistry and physics.
Examples
- The element with atomic number 5 is essential for the cell walls of plants.
- On the periodic table, atomic number 5 is found between beryllium (4) and carbon (6).
- The isotope boron-10, which has atomic number 5, is used in nuclear reactor control rods.
Advanced Usage
- In nuclear physics: The atomic number (Z) is a fundamental property. For atomic number 5, Z=5, which defines all boron isotopes regardless of their neutron count (e.g., boron-10, boron-11).
Variants and Related Words
- Boron (B): The common name for the element identified by atomic number 5.
- Metalloid: A category of elements, including boron (atomic number 5), that have properties intermediate between metals and nonmetals.
- Trivalent: Describing an atom with a valency of three, like boron (atomic number 5), which typically forms three bonds.
Synonyms
- Boron
- B (the chemical symbol)
Related Phrases/Idioms
(This term is a precise scientific identifier and is not used in idiomatic expressions.)
Noun
-
a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder
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