NDS U Che m 121 E xam 3 With S olution Calculate the energy of the photon emitted when the electron in a hydrogen atom relaxes from n=4 to n=2. - ANSWER 4.09 ×10^−19 J Which of the following scientists is credited with having invented the periodic table - ANSWER Mendeleev The emission wavelength of a Nd:YAG LASER is 1064 nm. What is the energy in kJ of a mole of photons from a Nd:YAG LASER. - ANSWER 112.5 kJ Which of the following most accurately describes any atomic orbital? - ANSWER The region of space around a nucleus in which an electron is most likely to be found Which of the following was concluded by Einstein based on the photoelectric effect? - ANSWER Light comes in small discrete amounts and has properties of particles, which he called photons What is the wavelength of an electron traveling at 7.27 ×106 m/s? - ANSWER 1.00×10−10 m (1.00 Å) What set of subshells can be occupied by electrons in the ground states of atoms for which n = 3? - ANSWER s, p, d Which of the following represents Werner Heisenberg's most significant contribution to quantum mechanics? - ANSWER The uncertainty principle relating position and momentum of particles What is the frequency of a photon of wavelength 500 nm? - ANSWER 6 ×
10^14 s −1 Which is the correct ground-state electron configuration for Si? - ANSWER 1s^2 2s^2 2p^6 3s^2 3p^2 Which is an allowed set of quantum numbers for the 2p electron of boron? - ANSWER n = 2, l = 1, ml = −1, mS = + ½ Which of the following is the most metallic and electropositive element on the periodic table? - ANSWER Fr Which of the following has the largest ionization potential? - ANSWER F
10^14 s −1 Which is the correct ground-state electron configuration for Si? - ANSWER 1s^2 2s^2 2p^6 3s^2 3p^2 Which is an allowed set of quantum numbers for the 2p electron of boron? - ANSWER n = 2, l = 1, ml = −1, mS = + ½ Which of the following is the most metallic and electropositive element on the periodic table? - ANSWER Fr Which of the following has the largest ionization potential? - ANSWER F
