hahnium

Thân thiện

A scientist points to the symbol for hahnium on a large periodic table.

Definition

1. Noun:
   • A transuranic element: Hahnium is a synthetic, radioactive chemical element. It is an artificially produced element with an atomic number higher than that of uranium (92). The name 'hahnium' was historically proposed for element 105.

Usage

• The term hahnium is used specifically in the context of chemistry and nuclear physics to refer to this man-made element. It is a proper noun for a specific element.
• Important Note: The element once called 'hahnium' is now officially named dubnium (Db). The name 'hahnium' (symbol Ha) is primarily of historical interest.

Examples

Advanced Usage

• Historical Nomenclature: The naming of this element was part of a historical "Transfermium Wars" dispute between American and Soviet scientific teams. The American team proposed 'hahnium' in honor of Otto Hahn, while the Soviet team proposed 'nielsbohrium'. The final, official name decided by IUPAC (International Union of Pure and Applied Chemistry) is dubnium.

Variants and Related Words

• Dubnium (Db): The official, current name for element 105.
• Transuranium element: Any chemical element with an atomic number greater than 92 (uranium). Hahnium/dubnium is one of these.
• Synthetic element: An element not found in nature and produced artificially in laboratories.

Synonyms

• Element 105: A neutral, numerical designation.
• Dubnium: The official synonym and current name.

Related Phrases/Contexts

• "The element formerly known as hahnium": A common phrase used to clarify the name change when discussing the history of the periodic table.
• "Synthesis of hahnium": Refers to the nuclear reaction experiments that created atoms of this element.

Học thuật

Noun

1. a transuranic element

Từ đồng nghĩa

• dubnium
• Db
• element 105
• atomic number 105