What is the correct order of energy of atomic orbitals in any given shell?

Under normal conditions,which of the following electronic configurations is able to form a dipositive ion?

Which of the following rules states that an orbital can hold a maximum of two electrons?

Statement $1$: The energy of an electron is determined by the principal quantum number.
Statement $2$: The principal quantum number $(n)$ indicates the distance of the electron from the nucleus.

If the given four electronic configurations:
$(i)$ $n=4, l=1$
$(ii)$ $n=4, l=0$
$(iii)$ $n=3, l=2$
$(iv)$ $n=3, l=1$
are arranged in order of increasing energy, then the order will be:

Explain $2p$ orbitals.