history of the atom

Question 1

Democritus 500BC

Answer 1

‘stuff’ is made out of atoms.

Question 2

John Dalton 1800 AD

Answer 2

Atoms are solid spheres ‘resemble snooker balls’

Question 3

JJ Thompson 1897

Answer 3

Plum pudding model ‘a ball of positive charge with negative electrons embedded throughout’.

Question 4

Ernest Rutherford 1909

Answer 4

Nucleus, ‘electrons orbit the nucleus’.

Question 5

Niels Bohr 1913

Answer 5

Shells, ‘electrons found in shells’.

Question 6

Ernest Rutherford 1915

Answer 6

protons, positive charge found in nucleus.

Question 7

James Chadwick 1932

Answer 7

neutrons, no charge , found in nucleus.

Question 8

Who proposed the first atomic theory in the early 19th century?

Answer 8

John Dalton

Question 9

True or False: The atom was first theorized by Democritus in ancient Greece.

Answer 9

True

Question 10

Fill in the blank: The discovery of the electron was made by ______ in 1897.

Answer 10

J.J. Thomson

Question 11

What model of the atom did Ernest Rutherford propose based on his gold foil experiment?

Answer 11

Nuclear model of the atom

Question 12

Which physicist is known for developing the quantum mechanical model of the atom?

Answer 12

Niels Bohr