1.1 The Particle Model

Question 1

Atom

Answer 1

The smallest particle of an element, made of protons, neutrons and electrons

Question 2

Bohr model of the atom

Answer 2

A model that explains why electrons in orbit do not spiral in to the centre of an atom

Question 3

Electron

Answer 3

Subatomic particle surrounding the nucleus of an atom. It has a relative charge of -1, and a very small mass

Question 4

Electron shells

Answer 4

The orbits around an atom that are allowed for electrons in the Bohr model

Question 5

Model

Answer 5

A description, analogy, or equation that helps you to explain the physical world

Question 6

Neutron

Answer 6

Subatomic particle found in the nucleus of an atom. It has no charge and a relative mass of 1

Question 7

Nucleus

Answer 7

The small centre of an atom made of protons and neutrons

Question 8

Order of magnitude

Answer 8

A number to the nearest power of 10

Question 9

Plum-pudding model of the atom

Answer 9

Outdated model of the atom in which electrons are embedded in a sphere of positive charge

Question 10

Proton

Answer 10

Subatomic particle found in the nucleus of an atom. It has a relative charge of +1 and a relative mass of 1

Question 11

Rutherford model of the atom

Answer 11

A model with a positively charged nucleus and electrons in orbit around it