How much distance an electron revolving in 3rd orbit of He ion will travel in one second — Atomic Structure Chemistry Question

💡 Solution & Explanation

Distance travelled in one second is the speed of the electron. $v = 2.188 \times 10^6 \frac{Z}{n}$. For He$^+$ ($Z=2$) and $n=3$, $v = 2.188 \times 10^6 \times \frac{2}{3} \approx 1.458 \times 10^6$ m/s. The distance in 1s is $1.458 \times 10^6$ m. Therefore, correct answer is A.