Multiple choice question 15 if a sample of barium contains 2.3 x 1023 atoms of barium, how many grams of barium are in the sample? (2 points) 2points a 0.38 g b 2.62 g c 52.4 g d 359.5 g multiple choice question 16 if a sample of pure cadmium has a mass of 18.2 grams, how many moles of cadmium are in the sample? (3 points) 3points a 0.16 mol b 6.17 mol c 112.4 mol d 2045.7 mol multiple choice question 17 a laboratory has a 2.0-mol sample of pure selenium and a 2.0-mol sample of pure chromium. how many more grams of selenium than chromium does this represent? (2 points) 2points a 65.5 g b 53.9 g c 27.0 g d 13.5 g multiple choice question 18 which of the following has the greatest mass, in grams? (2 points) 2points a 0.5 mol lead (pb) atoms b 1 mole of hydrogen (h) atoms c 1 atom of silver (ag) d 25 atoms of iron (fe) multiple choice question 19 the order in which atomic orbitals are filled is based on what factor? (2 points) 2points a the potential energy of the orbital. b the highest energy level available. c the overall energy level of the orbital. d the available equivalent energy levels. multiple choice question 20 which of the following best describes how an electron moves when it absorbs or releases exact amounts of energy? (2 points) 2points a the electron moves to the ground state. b the electron moves between orbital levels. c the electron moves to bond with other electrons. d the electron moves beyond ionization potential. long answer question 21 explain, in your own words, why different elements produce different colors of light when heated. (4 points) 4points 1000 word(s) left multiple choice question 22 an electromagnetic wave that has a higher frequency than ultraviolet light will have than the ultraviolet light. (2 points) 2points a longer wavelength and higher energy b longer wavelength and lower energy c shorter wavelength and higher energy d shorter wavelength and lower energy multiple choice question 23 how are the wavelength and frequency of a wave related? (2 points) 2points a as frequency increases, wavelength increases b as frequency increases, wavelength decreases c wavelength remains constant as frequency changes d wavelength and frequency are not related multiple choice question 24 how many valence electrons are found in the outermost energy level of lithium (li)? (2 points) 2points a 1 b 2 c 3 d 4 multiple choice question 25 how many total electrons can be contained in the 5f sublevel? (2 points) 2points a 2 b 6 c 10 d 14 multiple choice question 26 what is the lowest numbered energy level where a d sublevel is found? (2 points) 2points a 2 b 3 c 4 multiple choice question 27 which of the following elements has two (2) valence electrons? (2 points) 2points a na b mg c al d s long answer question 28 an atom of nitrogen (n) contains a total of seven (7) electrons, but the following orbital notation for nitrogen is incorrect. explain the error in terms of the rules for electron arrangements. (4 points) nitrogen: 1s is filled with two electrons, 2s is filled with two electrons, 2p is shown to have two electrons in the first orbital, one electron in the second orbital, and no electrons in the third orbital. 4points 1000 word(s) left multiple choice question 29 how many orbitals are found in the 3p sublevel? (2 points) 2points a 1 b 3 c 5 d 7 multiple choice question 30 what is the ground state shorthand notation for manganese (mn)? (2 points) 2points a [kr] 4s23d5 b [kr] 4s24d5 c [ar] 4s23d5 d [ar] 4s24d5 multiple choice question 31 what element has three half-filled orbitals in the 3p sublevel? (2 points) 2points a nitrogen (n) b phosphorus (p) c aluminum (al) d boron (b) multiple choice question 32 which of the following is a reasonable ground-state electron configuration? (2 points) 2points a 1s22s22p43s2 b 1s21p62s22p6 c 1s22s22p63s23p64s24d10 d 1s22s22p63s23p64s23d5