Chapter 1.3

Question 0

J.J. Thomson

Answer 0

Experiment: Sent electric current in a gas discharge tube

Discovered: electrons

Model = raisin bun; electrons stuck in a solid ball

Question 1

John Dalton

Answer 1

*1st to make deductions about atoms ON THE BASIS OF EXPERIMENTS

Model = small, hard spheres

Question 2

Ernest Rutherford

Answer 2

Experiment: Alpha particles through gold foil

Discovered: nucleus; 10 years later: nucleus has protons and neutrons

Model = planetary model; electrons orbit nucleus

Question 3

Niels Bohr

Answer 3

Experiment: studied light being given off by atoms of elements in the gaseous state

Discovered: electrons exist in shells with specific amounts of energy

Model = Bohr Model ; electrons orbit the nucleus in specific shells with a specific amount of energy

Question 4

Atom

Answer 4

Smallest part of an element

Question 5

Subatomic particle

Answer 5

Particle smaller than an atom

Question 6

Mass

Answer 6

How much matter something has

Question 7

Proton

Answer 7

Positively charged subatomic particle

Question 8

Electron

Answer 8

Negatively charged subatomic particle, no mass

Question 9

Neutron

Answer 9

Subatomic particle with no charge

Question 10

Nucleus

Answer 10

Centre of atom with only protons (+) and neutrons (0).