Question

(a) Why does the He atom have a smaller radius than the H atom? (b) Why is the He
atom smaller than the Ne atom?

Answer 1

To quote one of our very good math and science tutors: “You will find here at Jiskha that long series of questions, posted with no evidence of effort or thought by the person posting, will not be answered. We will gladly respond to your future questions in which <b>your thoughts</b> are included.”

Answer 2

Think about the number of shells and the positive charge on the outside electrons.