Question

Which of the following statements is /are correct?

• A. The energy of an electron is largely determined by its principal quantum number
• B. The energy of electron in an orbital in the hydrogen atom depends upon the value of principal quantum number only
• C. The value of principal quantum number for $24^{\text {th }}$ electron is 3
• D. The principal quantum number is a measure of the most probable distance of finding the electron around the nucleus

Answer 1

Answer: (A), (B), (C), (D)

For one electron system energy of electron depends only on principal quantum number while for many electron system it depends on value of $( n +1)$
$24^{\text {th }}$ electron enters in $3 d$ orbital. Hence, its principal quantum number is $3$ .