Bohr Atomic Model :

Bohr Atomic Model :

In 1913 Bohr proposed his quantized shell model of the iota to clarify how electrons can have stable circles around the core. The movement of the electrons in the Rutherford model was flimsy on the grounds that, as indicated by old style mechanics and electromagnetic hypothesis, any charged molecule proceeding onward a bended way emanates electromagnetic radiation; consequently, the electrons would lose vitality and winding into the core. To cure the solidness issue, Bohr changed the Rutherford model by necessitating that the electrons move in circles of fixed size and vitality. The vitality of an electron relies upon the size of the circle and is lower for littler circles. Radiation can happen just when the electron hops starting with one circle then onto the next. The molecule will be totally steady in the state with the littlest circle, since there is no circle of lower vitality into which the electron can bounce.

Bohr's beginning stage was to understand that traditional mechanics without anyone else would never clarify the molecule's dependability. A steady iota has a specific size so any condition portraying it must contain some principal consistent or mix of constants with an element of length. The traditional basic constants- - to be specific, the charges and the majority of the electron and the core - can't be consolidated to make a length. Bohr saw, in any case, that the quantum consistent defined by the German physicist Max Planck has measurements which, when joined with the mass and charge of the electron, produce a proportion of length. Numerically, the measure is near the known size of iotas. This urged Bohr to utilize Planck's consistent in looking for a hypothesis of the particle.

Planck had presented his steady in 1900 of every an equation clarifying the light radiation produced from warmed bodies. As indicated by traditional hypothesis, similar measures of light vitality ought to be delivered at all frequencies. This isn't just in opposition to perception yet additionally suggests the ludicrous outcome that the complete vitality emanated by a warmed body ought to be limitless. Planck hypothesized that vitality must be radiated or retained in discrete sums, which he called quanta (the Latin word for "how much"). The vitality quantum is identified with the recurrence of the light by another principal consistent, h. At the point when a body is warmed, its brilliant vitality in a specific recurrence range is, as per old style hypothesis, relative to the temperature of the body. With Planck's theory, be that as it may, the radiation can happen just in quantum measures of vitality. On the off chance that the brilliant vitality is not exactly the quantum of vitality, the measure of light in that recurrence range will be diminished. Planck's equation effectively depicts radiation from warmed bodies. Planck's consistent has the elements of activity, which might be communicated as units of vitality duplicated by time, units of force increased by length, or units of precise energy. For instance, Planck's steady can be composed as  h = 6.6x10-34  joule seconds.

Utilizing Planck's consistent, Bohr acquired an exact recipe for the vitality levels of the hydrogen particle. He proposed that the rakish force of the electron is quantized- - i.e., it can have just discrete qualities. He accepted that generally electrons comply with the laws of old style mechanics by going around the core in round circles. Due to the quantization, the electron circles have fixed sizes and energies. The circles are named by a whole number, the quantum number n.