When sodium bromide forms, one electron moves from a sodium atom to a neutral bromine atom.
How does the charge on the bromine atom change?
Its charge changes from neutral to 1+1+1+
Its final charge cannot be determined without its proton number
Its charge changes from neutral to 1−1-1−
Its charge remains neutral because its nucleus is unchanged
119 exam-style questions on Edexcel GCSE Chemistry 2.3 Ionic bonding, covering 2.3.1 Ions and the formation of ionic bonds, 2.3.2 Naming and deducing formulae of ionic compounds, and 2.3.3 Giant ionic lattices. Each one has a worked solution and a mark scheme showing where the marks go.