Chemistry Essays

Chemistry Essays Chemistry Essay Chemistry Essay Name Date Class ORGANIZING THE ELEMENTS Study Packet Objectives * Explain how elements are organized in a periodic table * Compare early and modern periodic tables * Identify three broad classes of elements Vocabulary * periodic law * metals * nonmetals * metalloids Part A Completion Use this completion exercise to check your understanding of the concepts and terms that are introduced in this section. Each blank can be completed with a term, short phrase, or number. 1 7 2 10 9 8 6 5 4 3 Chemists used the _______ of elements to sort them into groups. The periodic table organizes the elements into vertical _______ and horizontal _______ in order of increasing _______. The table is constructed so that elements that have similar chemical properties are in the same _______. _______ have a high luster, or sheen, when cut. Most nonmetals are _______ at room temperature. Elements with properties that are similar to those of metals and nonmetals are called _______. Across the periodic table, the properties of elements become _______ metallic and _______ nonmetallic. 1. 2. 3. 4. 5. 6. 7. 8. 9. 0. 1 Name Date Class Part B True-False Classify each of these statements as always true, AT; sometimes true, ST; or never true, NT. 10. In his periodic table, Mendeleev arranged the elements in order of atomic number. 11. There are six periods in a periodic table. 12. Most of the elements in the periodic table are metals. 13. The elements within a period have similar properties. Part C Matching Match each description in Column B to the correct term in Column A. Column A 14. metals 15. periods 16. group 17. nonmetals 18. metalloids