1 / 8

Lesson Starter

Explore the history of the periodic table, focusing on the contributions of Mendeleev and Moseley. Discover how Mendeleev's periodic table predicted elements yet to be discovered and learn about Moseley's breakthrough with atomic number. Understand the modern periodic table and how it organizes elements based on their properties.

briannaj
Download Presentation

Lesson Starter

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Section1 History of the Periodic Table Chapter 5 Lesson Starter Share what you have learned previously about the periodic table.

  2. Section1 History of the Periodic Table Chapter 5 Objectives • Explain the roles of Mendeleev and Moseley in the development of the periodic table. • Describe the modern periodic table. • Explain how the periodic law can be used to predict the physical and chemical properties of elements. • Describe how the elements belonging to a group of the periodic table are interrelated in terms of atomic number.

  3. Section1 History of the Periodic Table Chapter 5 Mendeleev and Chemical Periodicity • Mendeleev noticed that when the elements were arranged in order of increasing atomic mass, certain similarities in their chemical properties appeared at regular intervals. • Repeating patterns are referred to asperiodic. • Mendeleev created a table in which elements with similar properties were grouped together—a periodic table of the elements.

  4. Section1 History of the Periodic Table Chapter 5 Mendeleev and Chemical Periodicity, continued • After Mendeleev placed all the known elements in his periodic table, several empty spaces were left. • In 1871 Mendeleev predicted the existence and properties of elements that would fill three of the spaces. • By 1886, all three of these elements had been discovered.

  5. Section1 History of the Periodic Table Chapter 5 Properties of Some Elements Predicted By Mendeleev

  6. Section1 History of the Periodic Table Chapter 5 Moseley and the Periodic Law • In 1911, the English scientist Henry Moseley discovered that the elements fit into patterns better when they were arranged according to atomic number, rather than atomic weight. • The Periodic Lawstates that the physical and chemical properties of the elements are periodic functions of their atomic numbers.

  7. Section1 History of the Periodic Table Chapter 5 Periodicity of Atomic Numbers

  8. Section1 History of the Periodic Table Chapter 5 The Modern Periodic Table • The Periodic Table is an arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column, or group.

More Related