Question

Calculate the radius of first excited state of He⁺ ion (in Å)

Answer 1

Answer is "1".

\(r = a_0 \frac{n^2}{z} \)

\(n = 2\)

\(z = 2\)

\(r = a_0 \frac{4}{2}\)

\(= 2a_0\)

\(= 2 \times 0.529\)

\(= 1.058\)

\(\approx 1\)