History of the atom

Question 1

What did John Dalton suggest and when

Answer 1

• atoms where solid spheres
• early 1800s
• different types of spheres made up different elements

Question 2

What did jj thompson suggest and when

Answer 2

• late 1800s
• plum pudding model
• atoms couldn’t just be solid spheres had negative charges in them

Question 3

Describe the plum pudding model and who created it

Answer 3

• jj thompson
• a general ball of positive charge with negative electrons embedded

Question 4

What did ernest rutherford suggest and when

Answer 4

• early 1900s
• alpha particle scattering experiment led to the nucleur model
• most of the atom was empty space but there was a positive centre
• discovered protons a few years later

Question 5

Describe the alpha particle scattering experiment and what could be concluded

Answer 5

• alpha particles were fired at a sheet of one atom thick gold
• most of them passed through- most of the atom was empty space
• some were reflected at different angles- there was a positive mass at the centre

Question 6

describe the nuclear model of the atom

Answer 6

compact positive nucleus with a cloud of negative charge around it

Question 7

What did neils bohr suggest and when

Answer 7

• the negative charge orbited the nucleus in shells
• early 1900s (after rutherfords nuclear model)

Question 8

what did james chadwick discover

Answer 8

neutrons

Question 9

In what order were subatomic particles discovered

Answer 9

electron -> proton -> neutron