Notes

Intermolecular Forces * Intermolecular forces are attractive and repulsive forces between the interacting atoms and molecules. * The force of attraction between the two temporary dipoles is known as dispersion force or London force. * Dipole –Dipole forces are attractive forces that act between the polar molecules with permanent dipole. * The Dipole –Dipole forces ... Read more

Kossel - Lewis Approach to Chemical Bond * In the nature, the system with more energy is less stable. In other words, the lowest energy state corresponds to the most stable state of the system. * So every system tends to attain stability by losing energy. * Atoms attain stability by the means of bond ... Read more

Need and Genesis of Classification * A periodic table helps classify all the known elements in rows and columns such that the periodicity in their properties becomes apparent. The periodic law defines this periodicity. * The classification of elements in a periodic table helps predict the properties of unknown elements. * Johann Dobereiner was the ... Read more

Atomic Particles * Matter is made up of atoms that further consist of sub-atomic particles. * Sub-atomic particles are electrons, protons, and neutrons. *  Protons are positively charged, electrons are negatively charged and neutrons are neutral. * Protons and neutrons have mass equivalent to a Hydrogen atom whereas electrons has a negligible mass. * Protons ... Read more

Classification of Matter * Chemistry is the branch of science that deals with the study of the composition, structure, properties of matter and changes it undergoes. * Anything that has mass and occupies space is known as matter. * Matter can exist in three physical states based on the arrangement of constituent particles – solid, ... Read more