The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:

The electrons are more likely to be found :

The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are :

The graph between $${\left| \psi \right|^2}$$ and r (radial distance) is shown below. This represents :