Identify the correct statements:
a) In an atom,the maximum number of electrons with $n=4$ and $m_s=+\frac{1}{2}$ is $16$.
b) There are $4$ subshells associated with $n=5$.
c) $n=2, l=1, m_l=0$ and $m_s=-\frac{1}{2}$ is a possible set of quantum numbers.
d) The number of radial nodes for $3s$ orbital is $2$.

What will be the maximum number of electrons in any atom having quantum numbers $n = 4, l = 2, m = -2$?

The number of unpaired electrons in $1s^2 2s^2 2p^3$ is:

The orbital angular momentum of an electron in an $s$ orbital is:

Indicate the number of unpaired electrons in: $(a)$ $P$,$(b)$ $Si$,$(c)$ $Cr$,$(d)$ $Fe$ and $(e)$ $Kr$.

Consider the electronic configuration for neutral atoms:
$(i) \ 1s^22s^22p^63s^1$ $(ii) \ 1s^22s^22p^64s^1$
Which of the following statements is/are false?
$(a)$ Energy is required to change $(i)$ to $(ii)$
$(b)$ $(i)$ represents $Na$ atom
$(c)$ $(i)$ and $(ii)$ represent different elements
$(d)$ More energy is required to remove one electron from $(i)$ than $(ii)$