For the H atom, the transition from the 2p state to the 1sstate is accompanied by the emission of a photon with anenergy of 16.2 × 10-19 J. For an Fe atom, the same transition (2p to 1s) is accompanied by the emission of X-raysof 0.193-nm wavelengths. What is the energy differencebetween these states in iron? Comment on the reason forthe variation (if any) in the 2p-1s energy-level spacing forthese two atoms.

Technetium (Tc; Z=43) is a synthetic element used as a ra-dioactive tracer in medical studies. A Tc atom emits a beta parti-cle (electron) with a kinetic energy (Eₖ) of 4.71X10⁻¹⁵J. Whatis the de Broglie wavelength of this electron (Eₖ=1/2mv²)

Which of the following combinations of quantum numbers is not allowed? O n = 4,1 = 2, m = 0, m, = 1/2 On = 2,1 = 1, m¡ = -1, mg 1/2 On = 3, 1 = 0, m¡ = 0, m, = -1/2 O n = 1,1 = 1, m = 0, m, = 1/2 O n = 4, 1 = 3, m¡ = -2, m, = -1/2

Which of the following statements is FALSE regarding transitions (between electronic energy levels) of hydrogen atoms? The frequency of the n = 1 to 3 transition is А higher than that of the n = 1 to 2 transition. The wavelength of the n= 1 to 3 transition is В higher than that of the n= 1 to 2 transition Above a certain frequency, called the ionization frequency, electrons are emitted from hydrogen atoms. C Below a certain frequency, called the ionization frequency, transitions of hydrogen atoms occur at a discrete set of frequencies.