3.1.1.1 Fundamental particles

Question 1

Describe the Dalton model of the atom

Answer 1

An atom is a solid indivisible sphere that cannot be destroyed
(1803)

Question 2

Describe J.J. Thomson’s model of the atom

Answer 2

Plum pudding model - Atom is a sphere of positive charge containing few negatively charged particles called electrons. They are distributed evenly in the positive sphere. (1897)

Question 3

Describe Rutherford’s model of the atom:

Answer 3

Nuclear model; atom as divisible units composed of positive charges concentrated in the nucleus, with electrons orbiting around the nucleus (1911)

Question 4

Describe Bohr’s model of the atom

Answer 4

Electrons in the atom are restricted to certain circular orbits around the positively charged nucleus (1913)

Question 5

Describe Chadwick’s model of the atom:

Answer 5

Discovered neutrons which helps balance out protons in the nucleus (1932)