Question

Consult an aufbau diagram. Which shell would be complete with 10 electrons?

f

d

p

s

Answer 1

An aufbau chart only shows the order in which electrons enter into the orbitals.

the options listed arent "shells" but "orbitals".

The term "shell" (as it's presented in textbooks) refers to principal energy level, n, and it's a whole number always equal or greater than 1.

the orbitals listed can hold a different number of electrons though,

s holds a max of 2 electrons
p holds a max of 6
d holds a max of 10
f holds a max of 14