Question

Which of these lists the energies of the sublevels, from highest to lowest? A. f > d > p > s B. d > p > s > f C. s > p > d > f D. d > f > s > p

Answer 1

Answer is: A. f > d > p > s.

Aufbau principle is a scheme used to reproduce the electron configurations of the ground states of atoms by successively filling subshells (orbitals) with electrons in a specific order.

Filling subshells in the following order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f.

The azimuthal quantum number (l) determines its orbital angular momentum and describes the shape of the orbital.  

s-orbitals (for example 1s, 2s) are spherically symmetric around the nucleus of the atom.  

p-orbitals are dumb-bell shaped. l = 0,1...n-1, when l = 1, that is p subshell.  

d-orbitals are butterfly shaped.  

f-orbitals are similar to the d orbital, but cut in half (eight lobes instead of four).

Answer 2

A because for example in n=4 we have all of these sub levels  4s is completed sooner than 4p and so