Atomic Structure

The atomic masses of He and Ne are 4 and 20 a.m.u., respectively. The value of the de Broglie wavelength of He gas at −73 °C is "$M$" times that of the de Broglie wavelength of Ne at 727 °C. $M$ is

The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [$a_0$ is Bohr radius]

The maximum number of electrons that can have principal quantum number, $n=3$, and spin quantum number, $m_s=-\frac12$, is

The work function ($\phi$) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is

Metal	Li	Na	K	Mg	Cu	Ag	Fe	Pt	W
$\phi$ (eV)	2.4	2.3	2.2	3.7	4.8	4.3	4.7	6.3	4.75

The state $S_1$ is

Energy of the state $S_1$ in units of the hydrogen atom ground state energy is

The orbital angular momentum quantum number of the state $S_2$ is

Given that the abundances of isotopes $^{54}$Fe, $^{56}$Fe and $^{57}$Fe are 5%, 90% and 5%, respectively, the atomic mass of Fe is

Match the entries in Column I with the correctly related quantum number(s) in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 × 4 matrix given in the ORS.