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Understanding the Periodic Table: Predictions, Organization, and Element Properties

This lesson explores the foundational concepts of the periodic table, including Dmitri Mendeleev's predictive measures for undiscovered elements based on their properties and atomic numbers. Further, we delve into Henry Moseley's contribution to arranging elements by atomic number, which clarified the periodic law. The course also covers grouping elements by similar properties, the significance of atomic number for positioning in the table, and the unique placement of hydrogen and actinide elements. Engage with essential questions about periodic trends and electron configurations to deepen your understanding.

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Understanding the Periodic Table: Predictions, Organization, and Element Properties

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  1. Chemistry Daily 10’s Week 7

  2. 1 1. Mendeleev left spaces in his periodic table and predicted the existence of three elements and their A. atomic numbers. B. colors. C. properties. D. radioactivity.

  3. 2. Moseley's work led to the realization that elements with similar properties occurred at regular intervals when the elements were arranged in order of increasing a. atomic mass. b. density. c. radioactivity. d. atomic number.

  4. 2 1. The periodic law states that the properties of elements are periodic functions of their atomic numbers. What determines the position of each element in the periodic table? a. mass number b. number of neutrons c. number of protons d. number of isotopes

  5. 2. Elements in a group or column in the periodic table can be expected to have similar a. atomic masses. b. atomic numbers. c. numbers of neutrons. d. properties.

  6. 3 1. The atomic number of lithium, the first element in Group 1, is 3. The atomic number of the second element in this group is A. 4. B. 10. C. 11. D. 18.

  7. 2. How much greater is the atomic number of the fourth element in groups 1, 2 and 18 than the preceding element? a. 3 b. 4 c. 18 d. 20

  8. 4 1. Identify the sublevels in a period that contains 32 elements. a. s, f b. s, p c. s, p, d d. s, p, d, f

  9. 2. The electron configuration of cesium, atomic number 55, is [Xe] 6s1. In what period is cesium? a. Period 1 b. Period 6 c. Period 8 d. Period 55

  10. 5 1. Hydrogen is placed separately from other elements in the periodic table because it a. is a gas. b. does not exist as a free element in nature. c. has atomic number one. d. has many unique properties.

  11. 2. To which block do the actinide elements belong? a. dblock b. s block c. fblock d. pblock

  12. Answers & Standards • 1.1 – c sc4 • 1.2 –d sc4 • 2.1 –c sc4b • 2.2 –d sc4 • 3.1 – c sc4 • 3.2 –c sc4 • 4.1 – d sc4 • 4.2 – b sc4 • 5.1 – d sc4 • 5.2 –c sc4

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