Tag: CBSE Chemistry

  • Chemistry IX | Structure of Atom | Part 1

    Structure of Atom | Part 1 INTRODUCTION Atom is the smallest particle of an element, does not found in free state but takes part in chemical reaction. Main Postulates of Dalton’s Atomic Theory All matter is made up of very small particles known as atoms. Atom can neither be created nor destroyed, it is the…

  • Chemistry X | Periodic Classification of Elements | Trends in the Modern Periodic Table

    Trends in the Modern Periodic Table Valency : As you know, the valency of an element is determined by the number of valence electrons present in the termost shell of its atom. Activity 5.6 How do you calculate the valency of an element from its electronic configuration? What is the valency of magnesium with atomic…