Question

Alt 5) Circle the larger species (atomic or ionic radius) from each pair and explain the reasoning for your selection (2 points each). Pair As or At $2. or Ca2 Al or S Explain the reasoning for one of the pairs in part A. You must mention both species in the pair specifically in your explanation. (2 points).

Answer 1

5) as we know top to bottom atomic radius increases and left to right atomic radius decreases.

At

S^{​​​​​​2-}​

Al

Explanation of Al and S

As we know Al and S both are in same period. Left to right effective nuclear charge increases hence atomic radius decreases. Al has less effective nuclear charge than S

So ,Al is larger than S.