A subshell $$n=3, l=2$$ can accommodate maximum of

If the work function for the photoelectron emission of a metal is 3.75 eV, then the threshold wavelength of the radiation needed for the ejection of the electron is approximately

With increasing principal quantum number, the energy difference between adjacent energy levels in $$\mathrm{H}$$-atom ............ .

The electronegativity of the given elements increases in the order.