1. In the context of ancient Greek philosophy, what do the four elements earth, air, fire, and water represent?
2. Who discovered the electron and in what year?
3. What was the main purpose of Dalton's atomic model?
Ancient Greek elements — definition?
Fundamental substances: earth, air, fire, water.
Dalton's atomic model — key idea?
Atoms as solid, indivisible spheres.
Electrons — discovery year?
Discovered in 1897 by Thomson.
Elements — Greek definition?
Fundamental substances, earth, air, fire, water.
Atoms — Greek concept?
Indivisible particles, foundation of matter.
Dalton’s model — description?
Solid, indivisible spheres.
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