Definition

Noun: - A radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gases; occurs naturally (especially in areas over granite) and is considered a hazard to health. This is the scientific definition for the chemical element with the symbol Rn and atomic number 86, known as radon.

Usage

• The term 'atomic number 86' is used primarily in scientific, technical, and educational contexts to precisely identify the element radon by its fundamental property—the number of protons in its nucleus.
• It is a formal and unambiguous identifier, especially useful in chemistry, physics, and environmental science.

Examples

• Scientific Context:
  • The periodic table lists radon with atomic number 86.
  • Elements are uniquely defined by their atomic number; for radon, that is 86.
  • The study focused on the health risks associated with atomic number 86 seeping into basements.

Advanced Usage

• In Classification: The phrase is used to place the element within the periodic table's systematic order.
  • All atoms containing 86 protons in their nucleus are atoms of atomic number 86, regardless of the number of neutrons.

Variants and Related Words

• Radon (Rn): The common name for the element identified by atomic number 86.
• Noble Gas / Inert Gas: The family of elements to which atomic number 86 belongs.
• Radioactive Element: A key property of atomic number 86.

Synonyms

• Radon: The direct and most common synonym.
• Rn: The chemical symbol.

Notes on Meaning

• The term 'atomic number 86' has only one specific meaning: it is the numerical identifier for the element radon. It is not used idiomatically or in phrasal verbs. Its usage is strictly technical and denotative.

Noun

1. a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health