Aiming for Grade 4 LOs:

• State the relative charges and masses of sub-atomic particles.
• State that atoms have no overall charge (are neutral).
• Label the sub-atomic particles on a diagram of a helium atom.

Aiming for Grade 6 LOs:

• Describe atoms using the atomic model.
• Explain why atoms have no overall charge.
• Use atomic number and mass numbers of familiar atoms to determine the number of each sub-atomic particle.

Aiming for Grade 8 LOs:

• Use the Periodic table to find atomic number and mass number data and use it to determine the number of each sub-atomic particle in any given form.
• Recognise and describe patterns in sub-atomic particles of elements listed in the Periodic Table.
• Explain why we can be confident that there are no missing elements in the first 10 elements of the Periodic Table.