Radium () is a radioactive element found below barium at the bottom of Group 2. Working with a partner, apply your knowledge of trends in Group 2 to discuss and predict its density.
Important Questions on Group 2
Radium () is a radioactive element found below barium at the bottom of Group 2. Working with a partner, apply your knowledge of trends in Group 2 to discuss and predict its metallic radius.
Which one of the following electronic configurations correctly describes a calcium ion?
Write a half equation to show the conversion of a calcium atom into a calcium ion.
Add up the first two ionisation energies of the Group 2 elements shown in the table below, and record your results in a table.
| Group 2 | First ionisation energy / kJ mol-1 |
Second ionisation energy / kJ mol-1 |
| beryllium (Be) | 900 | 1760 |
| magnesium (Mg) |
736 | 1450 |
| calcium (Ca) | 590 | 1150 |
| strontium (Sr) | 548 | 1060 |
| barium (Ba) | 502 | 966 |
Draw a sketch graph to show the sum of the first two ionisation energies against the atomic number for the Group 2 elements beryllium to barium. Discuss the trend shown on your graph and how this might affect the reactivity of the Group 2 elements.
| Element | First ionisation energy/ | Second ionisation energy/ |
