Chemical element
01
化学元素, 单质
any of the simple chemical substances that consist of atoms of only one type, such as gold, oxygen, carbon, etc.
例子
Hydrogen is the lightest chemical element and is found in many compounds.
氢是最轻的化学元素，存在于许多化合物中。
Helium is a noble gas chemical element with the atomic number 2.
氦是一种原子序数为2的化学元素惰性气体。
