B2 Chap 1: Models of Particles

Question 1

Democritus

Answer 1

called particles “atoms”

Question 2

John Dalton

Answer 2

1) Matter is made up of atoms
2) Atoms are indivisible spheres
3) The types and number of atoms remain unchanged in a chemical reaction
4) The properties and masses of the atoms of the same element are identical

Question 3

atoms and molecules can be seen with

Answer 3

scanning tunnelling microscope (STM)

Question 4

molecules are made up of

Answer 4

atoms