Chemistry · May / June 2026 · Paper 11 · Question 4

The diagram shows the relative mass and the relative charge of two particles present in atoms and ions. [graph: relative mass (y-axis, 1 to 2000) against relative charge (x-axis, -1 to 0); a filled circle at relative charge -1, relative mass 1; an open circle at relative charge 0, relative mass 2000] Which of these particles are present in a hydrogen atom and in a hydrogen ion?

1. Ahydrogen atom: both ○ and ●; hydrogen ion: both ○ and ●
2. Bhydrogen atom: both ○ and ●; hydrogen ion: ○ but not ●
3. Chydrogen atom: ● but not ○; hydrogen ion: neither ○ nor ●
4. Dhydrogen atom: ○ but not ●; hydrogen ion: ● but not ○

As printed in the paper