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400 BCE
Democritus- Greek
He adopted the atomic theory from his mentor, Leucippus. His theory states:
1. All matter consists of invisible particles called atoms.
2. Atoms are indestructible.
3. Atoms are solid but invisible.
4. Atoms are homogenous.
5. Atoms differ in size, shape, mass, position, and arrangement.
For his experiment, he simply broke a seashell until all he could see is powder and concluded that it was indivisible. His atomic model was simply a sphere with no protons, neutrons, or electrons. -
Antoine Lavoisier- French
Lavoisier discovered many things that impact the chemistry world today. Such as:
Naming water and realising it's a compound of oxygen and hydrogen. He also named mercury and nitrogen. He then showed that combustion was due to the combination of a combustible substance with oxygen and that this forms gases. And later disproved phlogiston. Also developed the law of conservation of mass or matter.
One experiment included analysing the breath of a guinea pig that showed combustion.
