Radioactivity - The Nucleus

Question 1

Approximation for radius of atom

Answer 1

1 x 10^-10 metres

Question 2

Three subatomic constituents of an atom

Answer 2

Proton
Neutron
Electron

Question 3

Where is most of the mass of an atom concentrated

Answer 3

Nucleus

Question 4

Approx what proportion of the total radius of an atom is the radius of the nucleus

Answer 4

1 / 10,000

Question 5

Describe arrangement of protons and neutrons in an atom

Answer 5

Protons and neutrons found in the atoms nucleus

Question 6

Describe arrangement of electrons in an atom

Answer 6

Electrons found in discrete energy levels around the nucleus

Question 7

What type of charge does the nucleus of an atom have and why

Answer 7

Positive charge
Nucleus contains protons and neutrons
Protons have a positive charge, electrons have no charge so overall positive

Question 8

Two ways an atoms electron arrangement can be changed

Answer 8

Absorbing electromagnetic radiation
Emitting electromagnetic radiation

Question 9

Explain how an atoms electron arrangement changes when it absorbs EM radiation

Answer 9

Electrons move to higher energy levels
They move away from the nucleus

Question 10

Explain how an atoms electron arrangement changes when it emits EM radiation

Answer 10

Electrons move to a lower energy level
They move towards the nucleus