The number of quantum numbers required to describe an electron in an atom completely is

Which of the following orbitals will have $2$ nodal planes and $4$ total nodes?

The ground state energy of a hydrogen atom is $-13.6 \ eV$. Consider an electronic state $\Psi$ of $He^+$ whose energy,azimuthal quantum number,and magnetic quantum number are $-3.4 \ eV$,$2$,and $0$ respectively. Which of the following statement$(s)$ is(are) true for the state $\Psi$?
$(1)$ It has $2$ angular nodes
$(2)$ It has $3$ radial nodes
$(3)$ It is a $4d$ state
$(4)$ The nuclear charge experienced by the electron in this state is less than $2e$,where $e$ is the magnitude of the electronic charge.

$4d, 5p, 5f$ and $6p$ orbitals are arranged in the order of decreasing energy. The correct option is

The number of electrons in a nickel $(Ni)$ atom having $m = 0$ is:

Which of the sequences given below shows the correct increasing order of energy?