Question

32/35 the atom with the largest atomic radius in group 18 is - ar kr he rn

Explanation:

In Group 18 (noble gases), atomic radius increases as we move down the group because each subsequent element has an additional electron shell. The elements in Group 18 are He (Helium), Ne (Neon), Ar (Argon), Kr (Krypton), Xe (Xenon), Rn (Radon), etc. Among the given options (Ar, Kr, He, Rn), Rn (Radon) is the lowest in the group (has the most electron shells), so it has the largest atomic radius.

Answer:

Rn (Radon)