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The crystalline solids in which neutral atoms are held together by covalent bonds are called covalent crystals. These are also known as atomic solids. The […]

Crystal has been classified into four types on the basis of forces present between atoms, ions, or molecules in them. These forces are also called […]

In 1896, a German physicist. Eugen Goldstein discovered another type of ray called positive rays or canal ass in the gas discharge tube.  Experiment  Eugen […]

1.  Geometrical shape Crystalline solids have a definite, regular three-dimensional arrangement of particles. Each crystal has definite faces (sides) and definite angles (interfacial angles), between […]

Discovery of Electron Gas Discharge Tube •   It is a glass tube having two metallic electrodes sealed into it. •   It may contain a gas, […]

The behavior of electrons in space around the nucleus is described by a set of four numbers called quantum numbers. Schrodinger equation has been solved […]