The correct ground state electronic configuration of chromium atom is

Which of the following sets of quantum numbers is impossible for an electron?

If the quantum number values for the valence shell electron of an atom are $n = 4, l = 0, m = 0$,then the atomic number of the element could be .........

Which of the following statements is not correct for an electron that has the quantum numbers $n = 4$ and $m = 2$?

When the principal quantum number is $n = 3$,the possible values of the azimuthal quantum number $(l)$ are:

The electronic configurations of four elements are given in brackets: $L\,(1s^2, 2s^2 2p^1)$; $M\,(1s^2, 2s^2 2p^5)$; $Q\,(1s^2, 2s^2 2p^6, 3s^1)$; $R\,(1s^2, 2s^2 2p^2)$. Which element would most readily form a diatomic molecule?