CBSE Tutorials

Tag: Chemistry Notes

  • Chemistry IX | Matter-Its Nature and Behaviour | Part 1

    Matter-Its Nature and Behaviour | Part 1 INTRODUCTION Matter · Anything that occupies space , possesses mass and exert pressure is called matter. Element · An element is a substance which cannot be split up into two or more simpler substances by the any chemical and physical methods of applying heat, light or electric energy.…

  • Chemistry IX | Structure of Atom | Part 2

    Structure of Atom | Part 2 I. Thomson’s Atomic Model The first simple model of an atom was proposed by J.J. Thomson. According to this model an atom consists of a uniform sphere (radius approx 10 – 10 m) of positive charge with electron embedded in such a way so as to give most stable…