Evolving theories of matter

Events

Stone Age

8000 BC

(Stone Age) Matter was made up of solid material, which could be fashioned into tools.

Investigation of matter

6000 bc - 1000 bc

Chemists investigated properties of only those materials that were of high value to humans. (gold and copper)

Bronze age

4500 bc

(Bronze Age) The effect of heat on copper, lead to the creation of a strong material (bronze) for use as tools.

Iron age

1200 bc

(Iron Age) Iron combined with carbon to make steel, for even stronger tools.

Air-Water-Water

350 bc

Everything was made out of Air - Water - Earth - Fire (atomos particles)

Experimentation

1500

Theory of Matter was based more on experimentation. (History of Alchemy)

Boyle

1660

Particles can be compressed. (Boyle)

Lavosler

1770

System for the naming of chemicals was developed. (Lavoisier)

Air necessary

1780

Air is necessary for combustion to occur.

Observation of principles

1808

Observation principles during experimentation.

Raisin bun model

1897

Raisin bun model with charged particles

Negatively charged

1904

Negatively charged particles orbiting around nucleus.

Electrons rotate

1922

Electrons rotate randomly around the nucleus.