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Joseph Priestly discovers new gas called oxygen
Joseph Priestley and Antoine Lavoisier discover a new gas named oxygen, discrediting the basic theory of chemistry at the time -
Humphry Davy introduces nitrous oxide
Humphry Davy discovers what's now known as laughing gas. Davy started inhaling it himself to discover the effects. -
Dmitri Mendeleev creates the periodic table
Russian chemist Dmitri Mendeleev develops the periodic table -
Marie Curie discovers new elements
Marie curie discovers several elements including polonium and radium -
Henry Mosely investigates atomic numbers
Henry Mosely proves that every element's identity is based on number of protons it has
