Tag: Cathode rays

Science > Chemistry > Atomic Structure > Rutherford’s Atomic Model In this article, we shall study Thomson’s model of an atom and its deficiencies and Rutherford’s atomic model and its deficiencies. Thomson’s Model of an Atom: J. J. Thomson, in 1898, proposed that an atom possesses a spherical shape (radius approximately 10–10 m) in which the positive charge […]

Science > Chemistry > Atomic Structure > Discovery of Proton and Neutron In last article, we have discussed, the discovery of electron and characteristics of electron. In this article, we shall discuss the discovery of proton and neutron and their characteristics. Discovery of Proton: Proton was discovered by E. Goldstein in 1886. He performed the […]

Science > Chemistry > Atomic Structure > Discovery of Electron In this article, we shall study earlier concepts of an atom, discovery of electron, and its characteristics. 600 B.C. Indian saint and philosopher Maharshi Kanad proposed that matter is made up of the smallest individual particles. He called these particles ‘paramanu’. Around 400 B.C. The […]

Science > Chemistry > Atomic Structure > Radioactivity Radioactivity was discovered by French physicist Antoine Becquerel in 1896. The phenomenon of spontaneous and continuous and uncontrollable disintegration of an unstable nucleus accompanied by the emission of active radiations is called natural radioactivity. The substance which exhibits radioactivity is called a radioactive substance. e.g. Uranium, thorium, […]