Principal,azimuthal and magnetic quantum numbers are respectively related to

The number of correct statements from the following:
$A.$ For $1s$ orbital,the probability density is maximum at the nucleus.
$B.$ For $2s$ orbital,the probability density first increases to maximum and then decreases sharply to zero.
$C.$ Boundary surface diagrams of the orbitals enclose a region of $100\%$ probability of finding the electron.
$D.$ $p$ and $d$-orbitals have $1$ and $2$ angular nodes respectively.
$E.$ Probability density of $p$-orbital is zero at the nucleus.

If $n = 6,$ the correct sequence for filling of electrons will be

What is the maximum number of electrons that can be accommodated in an orbital with $l = 3$?

What is an orbital? Explain the point and boundary surface diagram of orbitals.

For the energy levels in an atom,which one of the following statements is correct?