Atomic structure

Question 1

Proton

Answer 1

Relative mass: 1
Relative charge: +1

Question 2

Neutron

Answer 2

Relative mass: 1
Relative charge: 0

Question 3

Electron

Answer 3

Relative mass: 1/1840
Relative charge: -1

Question 4

Atomic (proton) number

Answer 4

the number of protons in the nucleus

Question 5

Mass number

Answer 5

the number of protons added to the number of neutrons in the nucleus

Question 6

Structure of an atom

Answer 6

• a nucleus contains protons and neutrons
• one or more electrons in energy levels around the nucleus