Chemistry

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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.

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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.

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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

Column B

a. a vertical column of elements in the periodic table

b. good conductors of heat and electric current

c. poor...
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