The graph below illustrates how the first ionisation energy changes with the number of protons for some elements. Which statement is correct?
- AElements Q and Y are in the same period in the Periodic Table.
- BThe general increase from elements R to Y is due to increasing atomic radius.
- CThe small decrease between elements S and T is due to decreased shielding.
- DThe small decrease between elements V and W is due to repulsion between paired electrons.