Describe how the Dalton model of an atom has changed over time because of the discovery of subatomic particles

Describe the structure of an atom as a nucleus containing protons and neutrons, surrounded by electrons in shells

Recall the relative charge and relative mass of:

a) a proton
b) a neutron
c) an electron

Explain why atoms contain equal numbers of protons and electrons

Describe the nucleus of an atom as very small compared to the overall size of the atom

Recall that most of the mass of an atom is concentrated in the nucleus

Recall the meaning of the term mass number of an atom

Describe atoms of a given element as having the same number of protons in the nucleus and that this number is unique to that element

Describe isotopes as different atoms of the same element containing the same number of protons but different numbers of neutrons in their nuclei

Calculate the numbers of protons, neutrons and electrons in atoms given the atomic number and mass number

Explain how the existence of isotopes results in relative atomic masses of some elements not being whole numbers

Calculate the relative atomic mass of an element from the relative masses and abundances of its isotopes