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Periodic. Properties of the. Elements. Development of Periodic Table. • Elements in the same group generally have similar chemical properties. PERIODIC TABLE: ○ Dmitri Mendeleev – mid. 1800's. -proposed a table for 70 elements based on increasing mass and similar properties. For example, alkali metals have same valence shell electronic configuration ns1 , therefore, have similar properties. The long form of periodic table is the Periodic Table of the Elements Notes. ○ Arrangement of the known elements based on atomic number and chemical and physical properties. Short Notes on Periodic Table. Modern Periodic Table: Earlier scientists assumed that the properties of elements are periodic functions of their atomic The periodic law states that when the elements arearranged by increasing atomic number, there is aperiodic repetition of their chemical and physicalproperties.Dmitri Mendeleev was the first to organize the elements by their periodic properties. In 1871 he arranged the elements in vertical columns by their atomic Notes. Atomic Structure and. Chemical Bonding. Ist Proof. 4. PERIODIC TABLE AND. ATOMIC PROPERTIES e have seen different heaps of onions & potatoes at Unit 3 Notes: Periodic Table Notes. • John Newlands proposed an organization system based on increasing atomic mass in 1864.