Why does argon have a higher atomic radius than calcium?

Answer: Actually, Cl has a greater atomic radius than Ar because of the greater attraction from the nucleus in Ar. read more

No, argon's radius is smaller than calcium's radius because it is farther right to the periodic table than potassium and calcium. As you move from left to the right on the periodic table, the number of protons and electrons increase in the same shell. read more

calcium ion is definitely smaller than chloride ion due to its larger number of protons. However, Argon has tremendous radius because it's single atom gas. When the radius is measured, the only interaction between two atoms is the Van der Waals interaction, which makes the distance very large and the radius very large. read more