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Learning Objective: Mendeleev and Monsey's Periodic Table Development of the Periodic Table Need for Periodic Classification of Elements: Easier to classify and study the known elements. Organize the known information about elements. Patterns and trends in the behavior could be correlated. Lavoisier(Father of Modern Chemistry) divided elements into two main types known as metals and non metals. Dobereiner's Triad : In 1817, Johann Wolfgang Dobereiner's, classified elements into groups based on their properties. Basis of arrangement atomic mass. Atomic mass is the sum of the number of protons and neutrons in an element. Law of Triads: Dobereiner's Law of Triads sates that when three element in a triad are listed in the increasing order of their atomic masses, the atomic mass of the middle element will roughly be the average of the atomic masses of the other two elements. Limitations of  Triad: All known elements could not be classified into groups of triads on the basis

  Learning Objective: Collecting Information/understand the Periodic Table Activity: Group number to Valency Activity: To understand the relation between valency and group number of elements in the Periodic Table Write the electronic distribution of element (1 to 20) following the octet rule. Circle the valence electrons for the elements - Each with a different color Now group the elements with same valence electrons in a group and arrange them in ascending order. Check the periodic table if it follows the same pattern Octet Rule:     1.  Maximum possible electrons in the first shell is 2. (2n^2 where n is the shell number)     2.  The outermost or the last shell cannot have more than 8 electrons My Answer: Hydrogen (H) - 1;  1 Helium (He) - 2;  2 Lithium (Li) - 3;  2,1 Beryllium (Be) - 4;  2,2 Boron (B) - 5;  2,3 Carbon (C) - 6;  2,4 Nitrogen (N) - 7;  2,5 Oxygen (O) - 8;  2,6 Fluorine (F) - 9;  2,7 Neon (N) - 10;  2,8 Sodium (Na) - 11;  2,8,1 Magnesium (Mg) - 12;  2,8,2 Aluminum (Al)

  Learning Objective of 15/7/2021 Unpacking of the unit: (KC, RC, GC,SOI) Introduction to Periodic Table (Fundamental Properties of Elements) Development of Periodic Table Unit Details: Unit Name: Know your elements - Periodicity Key Concept: Relationships Related Concept: Change; Form; Pattern Global Context: Identities and Relationships Statement of Inquiry: The form of the periodic table is evolving due to knowledge-challenging discoveries, thus enhancing its function of showing trends in the physical and chemical properties of the elements. Activity: Identify 5 elements around you  Write down the name of the element with its correct symbol (like Na) Mention if it is a metal, non metal, metalloids. Atomic Number and Atomic Mass Uses (where you found it to be used) My Answer: - Mirage Chemistry