Valence Electrons: Electrons that are able to be gained, lost, or shared in the formation of chemical compounds. They exhibit the same type of chemical behavior. They have the same number of valence electrons. They have similar electron configurations. (Columns)Įlements within a group have several things in common: 1. What is the periodic law? When elements are arranged in order of increasing atomic number, their chemical and physical properties show a repeating pattern.ĭescribe the modern periodic table: Elements with similar properties are arranged in groups or families. He then arranged the elements in order of increasing atomic number, rather than atomic mass. How did Henry Moseley change the periodic table? He discovered atomic number, and found that when elements are arranged in the periodic table, their atomic number increases by 1. What did he predict? The existence of elements that had specific properties. What did he notice? When elements are arranged in order of increasing atomic weight, their chemical and physical properties repeated at regular intervals. Arranged elements in order of increasing atomic weight. How did he organize the elements? According to similarities in their chemical and physical properties. Chapter 5 Periodic Table Dmitri Mendeleev: Russian Chemist credited with the discovery of the periodic table.
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