The valence shell electronic configuration of `Cr^(2+)` ion is

The valence shell electronic configuration of the Fe^(2 +) is.

The valence shell electronic configuration of alkali metals is

The valence shell electronic configuration of alkali metals is

If the valence shell electronic configuration of an element is 3s^2 3p^1 in which block of periodic table is it placed ?

The atomic number of an element having the valency shell electronic configuration 4s^2 4p^6 is

The valence shell electronic configuration of Rb is __________.

The valence shell electronic configuration of Rb is __________.