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54. Compare the emission (or bright-line) spectra for hydrogen and helium, A) Hydrogen has only one electron, so it has only one line (at 656nm). Helium has two electrons, so it has the 656nm line and a second line at 435nm. The number of electrons matches the number of emission lines. Both spectra have several emission lines, but they are not the same lines at the same frequencies. B) C) The spectra are identical. Both H and He have four emission lines at precisely the same wavelengths. Trick question! Hydrogen can only form absorption lines, and helium can only form emission lines. D) Come at the Maybe he was just hungry and needed an Sn (Snickers). PERIODIC TABLE OF ELEMENTS PubChem Marke H Symbol M ***C -8--8-202 -1838 18- REN 18 811 188 CE ·2·1·2·82 +8+2 +8+2 5.2. 8.2 +81 + 2+ 3+2 +3 +8 O 28 S 5-8-28 2 03 Sl - 12 835 E 57. True or false: The periodic table is ordered by rows, but there is no order to the columns. 58. True or false: The rightmost column of elements on the periodic table are highly reactive. 59. True or false: Most elements have full valence shells, and as a result, exhibit strongly non-metallic characteristics. 60. Locate lithium (Li) on the periodic table. Which of the following elements is most likely to form a compound with lithium? A) Beryllium (Be) C) B) Fluorine (F) D) Sodium (Na) E) Argon (Ar) FI Titanium (Ti) None of these
PHYS 1400 61. A metallic element, like gold (Au) or platinum (Pt) A) has a full outermost (valence) shell, making it difficult to combine with other elements to form compounds. has an unfilled valence shell. If there are 1, 2, or 3 valence e, metals will lose er and become (+) when ionized. B) C) has an unfilled valence shell. If there are 5, 6, or 7 valence e, metals will gain e- and become (-) when ionized D) might gain or lose er when ionized. There are no rules to predict whether any atom will become (+) or (-). 62. A non-metallic element, like chlorine (CI) or bromine (Br) Al has a full outermost (valence) shell, making it difficult to combine with other elements to form compounds. has an unfilled valence shell. If there are 1, 2, or 31 valence e, non-metals will lose er and become (+) when ionized. B) C has an unfilled valence shell. If there are 5, 6, or 7 valence e non-metals will gain e- and become (-) when ionized. D) might gain or lose e when ionized. There are no rules to predict whether any atom will become (+) or (-). SPRING 2022 63. Noble gases A) have full valence shells. B) are colorless, odorless, and tasteless. C) have colorful emission spectra when excited. D) are non-reactive and do not form compounds with other elements. E) All of the above! A) 64. Why are there only 118 elements on the periodic table? Because that is how many have been discovered. There are an infinite number of elements, but you can't add them to the table before they have been discovered or created in the lab. B) Because there is an upper limit to how many protons you can have in a nucleus. Eventually the nucleus gets too big for the strong force to keep it bound together. Because there is an upper limit to how many neutrons you can have in a nucleus. Heavier nuclei require more neutrons, but if you add too many, they will begin to repel each other!