Definition

Noun: A rare, heavy, polyvalent metallic element that resembles manganese chemically and is used in some alloys. It is obtained as a by-product in refining molybdenum. This is the scientific definition for the element Rhenium.

Usage

The term "atomic number 75" is used almost exclusively in scientific and technical contexts to refer to the element rhenium. It specifies the element by the number of protons in its nucleus. * In chemistry, elements are often listed and organized by their atomic number. * It is used to avoid ambiguity, as the element's symbol (Re) or name (rhenium) are more common in general discourse.

Examples

• Scientific Context:
  • The periodic table lists rhenium at atomic number 75.
  • The sample was found to contain traces of atomic number 75.
  • Elements with atomic number 75 and higher are generally very dense.

Advanced Usage

• The term can be used in descriptive chemical nomenclature. For instance, an isotope might be specified as "rhenium-185 (atomic number 75)" to clearly identify the element before stating the mass number.

Variants and Related Words

• Rhenium (Re): The common name and chemical symbol for the element defined by atomic number 75.
• Transition Metal: The category of metallic elements to which rhenium (atomic number 75) belongs.
• D-Block Element: Refers to elements whose valence electrons are in the d orbital, including atomic number 75.

Synonyms

• Rhenium: The direct and most common synonym.
• Element 75: A less formal but equivalent scientific synonym.
• Re: The chemical symbol.

Related Phrases and Terms

• By-product of molybdenum refining: A key phrase describing the primary commercial source of atomic number 75 (rhenium).
• High-melting-point alloy: A common application, as alloys containing atomic number 75 are used in high-temperature environments like jet engines.

Noun

1. a rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys; is obtained as a by-product in refining molybdenum