稀き有ゆう元げん素そ

also: けうげんそ

き

ゆ

う

げ

ん

そ

Meanings

1

noun

chemistry

Chemistry term for an element that is scarce in the Earth's crust; often used in contexts like rare earth elements or trace elements. See also 希元素.

稀有元素
- きゆうげんそ
  Standard kanji spelling for 'rare element' in chemistry.
- けうげんそ
  Historical kana reading; rarely used in modern Japanese.
希有元素
- きゆうげんそ
  Variant spelling using 希 instead of 稀; both are used, but 稀有 is more common.
- けうげんそ
けうげんそ

希き元げん素そ
Synonym for rare element; 希元素 is a shorter form, while 稀有元素 is more explicit and slightly more formal.
レアアース
Refers specifically to rare earth elements (a subset of rare elements); 稀有元素 is a broader term.

Compound of 稀有 (rare, uncommon) and 元素 (element). The reading きゆうげんそ is standard; けうげんそ reflects historical kana usage.