Scientists Names

Question 1

•Democritus(450 BCE)

Answer 1

• came up with the word “atom”
  -if matter were to be continually cut into smaller and smaller pieces then; at some point, there would be a piece which would be so small as to be indivisible.

Question 2

Alchemy(500-1400 AD)

Answer 2

• alchemical symbols for substances

Question 3

Aristotle and Plato’s Theories

Answer 3

• 4 elements: fire, air, water, earth
  -4 properties: hot, cold, dry, wet

Question 4

John Dalton (1766-1844)

Answer 4

• modern atomic theory-1809
• atoms are smallest particle
• same atom/element = same properties

Question 5

J.J Thompson(1897)

Answer 5

• discovered electrons and plum pudding model

Question 6

Ernest Rutherford

Answer 6

• Radioactivity work (won noble prize)
• Gold foil Experiment (1909) |
• Discovered small, dense, positive nucleus at center
  -Discovered that electrons float around the nucleus
  -worked with Chadwick to discover Neutrons

Question 7

Niel Bohr

Answer 7

• Electrons move in orbits -1913
• Develop Quantum model for Hydrogen atom
• Ground State: lowest energy State for an atom

Question 8

D.A.AP.JD.JJT.ER.NB

Answer 8

short to remember names