List of top Chemistry Questions on Atomic Structure asked in CPET

The Aufbau principle is not correctly obeyed in the ground state electronic configuration of the pair:

For the principal quantum number \(n = 5\), the maximum number of electrons that can occupy that shell is:

The ionization energy of the hydrogen atom is 13.6 eV. What will be the ionization energy of He⁺ (Z=2, one-electron ion)?

Which one of the following atomic spectral transitions is forbidden (by the selection rule \(\Delta l = \pm 1\))?

If the principal quantum number of an atom is 3, then the angular (azimuthal) quantum number is:

The de Broglie wavelength of an \(\alpha\) particle of mass \(6.68 \times 10^{-27}\) kg ejected from radium at a speed of \(1.5 \times 10^{7}\) ms\(^{-1}\) is (h = 6.62 \(\times 10^{-34}\) Js):

The orbital with two radial and two angular nodes is:

How many lines are produced when an electron jumps from the fifth to the second orbit for a hydrogen atom?

How many electrons in an atom have the following quantum numbers? \(N = 3, l = 0\)