Total number of angular nodes of orbitals associated with third shell $(n=3)$ of an atom is

Total number of unpaired electrons in an atom of atomic number $29$ is

Which of the following statement$(s)$ is/are true?
$A$. If two orbitals have the same value of $(n+l)$,the orbital with lower value of $n$ will have lower energy.
$B$. Energies of the orbitals in the same subshell increase with increase in atomic number.
$C$. The size of $2p_x$ orbital is less than the size of $3p_x$ orbital.
$D$. Among $5f, 6s, 4d, 5p$ and $5d$ orbitals,none of the orbitals have $2$ radial nodes.

Explain $2p$ orbitals.

In an atom having $2$ $K$,$8$ $L$,$8$ $M$ and $2$ $N$ electrons,the number of electrons with $m=0$ and $s=+\frac{1}{2}$ is $:-$

In $Cu$ (Atomic number $Z = 29$),which of the following statements regarding the electron spin is correct?