Watch the stroke order, then trace it yourself.


hydrogen bomb
hydrogen gas
hydrogen energy
hydrogen atom
sodium hydroxide
Hydrogen gas is a very light gas.
Hydrogen energy is considered one of the future clean energy sources.
A water molecule consists of one oxygen atom and two hydrogen atoms.
Scientists are researching how to use hydrogen energy safely.
This experiment requires a small amount of sodium hydroxide.
Explore characters by relationship
Characters pronounced "qing".
Characters with radical "气".