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Name ___________________________ Chapter 5
The Periodic Table
Section 5.1 Organizing the Elements (pages 126–129) This section explains how Mendeleev organized elements into a periodic table. It also discusses the predictions he made about undiscovered elements and how the discovery of those elements supported his version of the table of the table.
Identifying Main Ideas As you read, complete the table by identifying the main idea for each topic. For more information on this reading strategy, see the Reading and Study Skills in the Skills and Reference Handbook at the end of your textbook. Topic
Mendeleev arranged the elements into rows in order of increasing mass so that elements with similar properties were in the same column.
Mendeleev used the properties of existing elements to predict properties of undiscovered elements.
Evidence supporting Mendeleev’s table
The close match between Mendeleev’s predictions and the actual properties of new elements showed how useful his periodic table could be.
1. Is the following sentence true or false? The first elements to be false identified were mainly gases. 2. As the number of known elements grew, so did the need to organize properties them into groups based on their . 3. Circle the letter of each category that the French chemist Antoine Lavoisier used to classify elements. a. gases b. metals c. liquids d. nonmetals
Mendeleev’s Periodic Table
4. Is the following sentence true or false? Mendeleev needed to true organize information about 63 elements. 5. Mendeleev’s strategy for classifying elements was modeled on a(n) card game or solitaire . 6. Circle the letter of each type of information Mendeleev knew about each element. a. name b. number of protons c. relative mass d. properties Physical Science Reading and Study Workbook
Name ___________________________ Chapter 5
The Periodic Table
7. Mendeleev arranged the elements into rows in order of increasing mass so that elements with similar properties were in the same column. 8. Is the following sentence true or false? A periodic table is an arrangement of elements in columns, based on a set of properties true that repeat from row to row.
9. Mendeleev published the table above in 1872. Why did Mendeleev leave some locations in his periodic table blank? He left room for undiscovered elements.
He placed them where they fit best based on their properties.
12. Is the following sentence true or false? Mendeleev was the first false scientist to arrange elements in a periodic table. 13. Describe a test for the correctness of a scientific model. One test is whether the model can be used to make accurate predictions.
14. Mendeleev used the properties of elements located near the spaces in his table to predict properties for undiscovered elements. 15. The close match between Mendeleev’s predictions and the actual properties of new elements showed how useful his periodic table could be . 16. Circle the letter of each element that was discovered after Mendeleev published his periodic table that supported Mendeleev’s predictions and provided evidence validating the table. a. gallium b. scandium c. germanium d. aluminum 48
10. Circle the letters of two elements that have similar properties. a. zinc (Zn) b. chlorine (Cl) c. nitrogen (N) d. bromine (Br) 11. How did Mendeleev decide where to place arsenic (As) and selenium (Se)?