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Name: _______________________ Date: _____ Pd: _____ Chemistry, PERIODIC TABLE 1. Based on Reference Table S, atoms of which of these elements have the strongest attraction for the electrons in a chemical bond? (1) S (2) Si (3) P Spring, Regents Prep Pre/Post Test ANSWER 10. Which particle diagram represents a sample of one compound, only? (4) Al 2. Which electron-dot symbol correctly represents an atom of its given element? (1) (2) (3) (4) (1) (2) (3) (4) 3. Atom X has an electron configuration of 2-8-2. Which electron-dot symbol correctly represents this atom? (1) (2) (3) (4) 4. Which trends are observed when the elements in Period 3 on the Periodic Table are considered in order of increasing atomic number? (1) The atomic radius decreases, and the first ionization energy generally increases. (2) The atomic radius decreases, and the first ionization energy generally decreases. (3) The atomic radius increases, and the first ionization energy generally decreases. (4) The atomic radius increases, and the first ionization energy generally increases. 11. What is the number of electrons in an Al3+ ion? (1) 10 (2) 13 (3) 3 (4) 16 5. Which element has both metallic and nonmetallic properties? (1) Rb (2) Sr (3) Rn (4) Si 6. An atom of argon in the ground state tends not to bond with an atom of a different element because the argon atom has (1) (2) (3) (4) a total of eight valence electrons more protons than neutrons a total of two valence electrons more neutrons than protons 7. Which trends are observed as each of the elements within Group 15 on the Periodic Table is considered in order from top to bottom? (1) Their metallic properties decrease and their atomic radii increase. (2) Their metallic properties increase and their atomic radii decrease. (3) Their metallic properties increase and their atomic radii increase. (4) Their metallic properties decrease and their atomic radii decrease. 8. An Mg atom differs from an Mg2+ ion in that the atom has a (1) smaller nucleus (3) larger radius (2) larger nucleus (4) smaller radius 9. In Period 2 of the Periodic Table, which Group contains the element with the highest first ionization energy? (1) halogens (3) noble gases HSVD (2) alkaline earth metals (4) alkali metals Ms. Chang Page 1 12. Base your answer to the following question on the information below. The ionic radii of some Group 2 elements are given in the table below. On the same grid, plot the data from the data table. Circle and connect the points. 13. Explain, in terms of atomic structure, why Group 18 elements on the Periodic Table rarely form compounds. Base your answers to questions 14 and 15 on the information below and on your knowledge of chemistry. Silver-plated utensils were popular before stainless steel became widely used to make eating utensils. Silver tarnishes when it comes in contact with hydrogen sulfide, , which is found in the air and in some foods. However, stainless steel does not tarnish when it comes in contact with hydrogen sulfide. 14. Draw a Lewis electron-dot diagram for the compound that tarnishes silver. 15. In the ground state, an atom of which noble gas has the same electron configuration as the sulflde ion in HSVD Ms. Chang ? Page 2 Answer Key Periodic Table Pre/Post Test 1. 1 2. 2 3. 2 4. 1 5. 4 6. 1 7. 3 8. 3 9. 3 10. 4 11. 1 14. 15. –Ar –argon –element 18 12. 13. HSVD Group 18 elements rarely form compounds because their atoms have stable electron configurations. –Their valence shells are completely filled. –All the elements have maximum numbers of valence electrons. –Atoms of Group 18 have a stable octet except He, which is stable with two electrons. Ms. Chang Page 3