Spec 1CH0
Revise Edexcel GCSE Chemistry 2.1.2 Structure of the atom and subatomic particles with the question bank, lessons, revision guides, and flashcards.
1.2 Describe the structure of an atom as a nucleus containing protons and neutrons, surrounded by electrons in shells. 1.3 Recall the relative charge and relative mass of a proton, a neutron and an electron. 1.4 Explain why atoms contain equal numbers of protons and electrons. 1.5 Describe the nucleus of an atom as very small compared with the overall size of the atom. 1.6 Recall that most of the mass of an atom is concentrated in the nucleus.
