1868, coined from Greek helios "sun" (see sol), because the element was detected in the solar spectrum during the eclipse of Aug. 18, 1868, by English astronomer Sir Joseph N. Lockyer (1836-1920) and English chemist Sir Edward Frankland (1825-1899). It was not actually obtained until 1895; it was assumed before that to be an alkali metal, hence the ending in -ium.
例文
1. Helium is a very light gas.
ヘリウムは非常に軽いガスである。
2. Helium is a gas used in balloons.
ヘリウムは気球用の気体である。
3.Unlike helium ?4,it cannot be produced by radioactive decay.
ヘリウム?4と異なる点は、ヘリウム?3が放射性減衰によって生成されない点である。
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テクノロジー
4.The helium ?3 apparently became trapped when the earth was formed.
は明らかに、ローカルボールが形成されるとヘリウム?3がトラップされる。dd>
テクノロジー
5.After hydrogen,the atom with the simplest structure is that of helium .