Potassium is in group 1 and bromine is in group 7 of the periodic table. A student draws a dot-and-cross diagram for potassium bromide, showing only outer-shell electrons. Electrons from potassium are shown as crosses and electrons from bromine are shown as dots.
Which description of the ions in the completed diagram is correct?
The potassium ion has one cross and the bromide ion has seven dots and one cross.
The potassium ion has one cross and the bromide ion has eight dots.
The potassium ion has no crosses and the bromide ion has eight dots.
The potassium ion has no crosses and the bromide ion has seven dots and one cross.
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.