helium
大学
FREQ #14997
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n. 氦 [化] 氦
发音
US
/ˈhiː.li.əm/
US
/ˈhiː.li.əm/
词形变化
heliums
复数
heliums
教材释义与例句
名词
氦（符号为He，2号元素）
释义与例句
n.
-
1.
The second-lightest chemical element (symbol He), with an atomic number of 2 and atomic weight of 4.002602, a colorless, odorless and inert noble gas.
氦
氜
不可数 可数 -
2.
A form or sample of the element.
可数 不可数
词汇关系
相关短语
词源
From New Latin helium, from Ancient Greek ἥλιος (hḗlios, “sun”) (because its presence was first theorised in the Sun's atmosphere) with the suffix + -ium. Probably coined by Norman Lockyer. This suffix is unusual, because it is usually used only for metallic elements. It is likely that Lockyer, being an astronomer, was unaware of the usual chemical conventions.
来源：wiktionary