Answer:
The number of energy level increases
Explanation:
As you down the a periodic group, the atomic radius increases because there is an increase in the energy levels. This increase is evident by the addition of subsequence electronic shell down the group.
- The atomic radius is half of the internuclear distance between two covalently bonded atoms of non-metallic elements.
- it is also half the distance between two nuclei in the solid state of metals
- Atomic radius increases down a group due to successive shells being added.
- The new shells compensates for the size reducing effect of the increased nuclear charge
