What is the electronic configuration of $Cr$?

For the configuration shown,which rule is violated?

Consider the following sets of quantum numbers. Which of the below settings is not a permissible arrangement of electrons in an atom?

Which of the following does not follow the Aufbau principle?

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:

Which of the following sets of quantum numbers is possible?