hydrogen
Definition
A chemical element with the symbol H and atomic number 1; the lightest and most abundant element in the universe.
日本語 化学元素; 記号H、原子番号1; 宇宙で最も軽く最も豊富な元素
Example
"Hydrogen combines with oxygen to form water."
A chemical element with the symbol H and atomic number 1; the lightest and most abundant element in the universe.
日本語 化学元素; 記号H、原子番号1; 宇宙で最も軽く最も豊富な元素
"Hydrogen combines with oxygen to form water."