The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

A HYDROGEN atom, H,
plus pigs minus P, "higs."
The Big Bang Theory Season 3, Episode 13

Didn't you say you're making
HYDROGEN sulfide gas?
The Big Bang Theory Season 4, Episode 4

HYDROGEN was a little more
common or a little less common.
The Big Bang Theory Season 7, Episode 5

- What are you doing in there?
- I'm making HYDROGEN sulfide...
The Big Bang Theory Season 4, Episode 4

they theoretically can separate
the HYDROGEN from the oxygen,
Breaking Bad Season 2, Episode 12