Question

Circle the atom in each pair that has the largest atomic radius
group A.Al b
Group B. S O
Group C. Br Cl
Group D. Na Al
Group E. O F
Group F. Mg Ca

Answer 1

Here are the atoms with the largest atomic radius from each group:

- **Group A: Al** (Aluminum has a larger atomic radius than B, boron)
- **Group B: S** (Sulfur has a larger atomic radius than O, oxygen)
- **Group C: Br** (Bromine has a larger atomic radius than Cl, chlorine; as you go down the group, atomic radius increases)
- **Group D: Na** (Sodium has a larger atomic radius than Al, aluminum)
- **Group E: O** (Oxygen has a larger atomic radius than F, fluorine; although both are small, oxygen is slightly larger as you move across the period)
- **Group F: Ca** (Calcium has a larger atomic radius than Mg, magnesium)

So, the answers are:
- **Group A: Al**
- **Group B: S**
- **Group C: Br**
- **Group D: Na**
- **Group E: O**
- **Group F: Ca**