CAIE IGCSE Chemistry Ionic Bond Formation

Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise showing electron transfer between Group I and Group VII atoms and drawing the resulting ions with full outer shells and correct charges.

How this is tested

show a Group I atom losing one electron and a Group VII atom gaining that electron
draw bracketed dot-and-cross ions with complete outer shells and the correct charges
describe the ionic bond as electrostatic attraction between the positive and negative ions

[Maximum number: 1]

The Group I element potassium forms an ionic bond with the Group VII element fluorine.
Which two ions are produced?

$\mathrm{K}^{+}$ and $\mathrm{F}^{+}$

$\mathrm{K}^{+}$ and $\mathrm{F}^{-}$

$\mathrm{K}^{-}$ and $\mathrm{F}^{-}$

$\mathrm{K}^{-}$ and $\mathrm{F}^{+}$