A-Z Pharma science

Bohr’s model of Atom: By utilizing the previous model’s on atom and molecules, Neils Bohr developed his own model. In Bohr’s model two major developments were introduced : Electromagnetic radiations having both wave-like and particle-like properties. The experimental results of atomic spectra. Wave nature of electromagnetic radiation: In the mid-nineteenth century, physicists studied that thermal radiations that are emitted by heated objects consist of electromagnetic waves of various frequencies or wavelengths. But James Maxwell in 1870 was the first who gives a good explanation about the electromagnetic waves or radiation , where he suggested that when any electrically charged particles are under acceleration, they produce and transmit alternating electrical and magnetic fields which are transmitted in the form of waves. Maxwell also reveals- the oscillating electric and magnetic character of light waves. After considering all the aspects we can summaries the properties in th...

Atom The fundamental building blocks of matters are atoms- not be further divisible. The word ‘atom’ was derived from the Greek word ‘ a-tomio ’ which literally means “non-divisible”. The atomic theory of matter was first proposed by a British schoolteacher John Dalton in 1808 which is known to us as Dalton’s atomic theory . This theory explains the law of conversion of mass, constant composition, and the law of multiple proportions of an atom. However, it failed to explain why substances like glass or ebonite get electrically charged when rubbed with silk or fur. Sub-Atomic Particles: The structure of an atom was obtained from various experiments on electrical discharge through gases. The experiments which were followed to discover the subatomic particles are as follows- Michael Faraday and many scientists in 1850 , known as Cathode ray discharge tube which conclude that- the movement of cathode rays from cathode to anode in the presence of electrical or magnetic fie...