Answer:
Potassium > Vanadium > Zinc > Bromine
Step-by-step explanation:
The size of an atom can be difficult to estimate. It is measured in terms of the atomic radius.
It is the taken as half of the inter-nuclear distance between covalently bonded atoms of non-metallic elements or half the distance between two nuclei in the solid state of metals.
- Across a period atomic radius decreases from left to right.
- Down a group from top to bottom, atomic radii increases progressively.
The elements given all lie in the same period so their atomic radius decreases.