What is atomic models?, Physics

Assignment Help:

What is Atomic Models?

The concept of atoms was first suggested by the ancient Greeks. The atom was supposed to be the smallest piece of matter. Then J. J. Thompson discovered the electron, and the atom was found to be made of several smaller pieces. Ernest Rutherford conducted an experiment in which he shot alpha particles at thin gold foil. Based on his observations, he constructed a model of an atom that was mostly empty space. Practically all of the atom's mass is concentrated in a very small central nucleus, which is positively charged because of its protons; the nucleus is surrounded by an equal number of negatively charged electrons that are relatively far away.

In 1913, Niels Bohr postulated that the hydrogen atom had one proton with one electron, which could only occupy definite allowed orbits. The most stable orbit is the one closest to the nucleus, and the atom is in the ground state when the electron occupies this most stable orbit. Only certain amounts of energy can be absorbed and used in order to have the electron jump to a higher energy orbit. When the electron returns to the lowest orbit, the atom can only give off a photon of energy equal to the change in energy of the electron. Only orbits where mvr = nh/2Π for the electron are possible. The principal quantum number, n, can be 1, 2, 3, 4, etc. The diagram shows the energy levels of hydrogen.


Related Discussions:- What is atomic models?

Heat therapy - b-infrared (ir) radiant heat, B-Infrared (IR)  Radiant Heat...

B-Infrared (IR)  Radiant Heat Heat radiation can be achieved by using infrared (IR) radiation it penetrates about 3mm in the skin. excessive exposure can cause erythema(redden

State lenzs law, Q State Lenz's law. Lenz's law declares that the indu...

Q State Lenz's law. Lenz's law declares that the induced current produced in a circuit always flows in such a direction that it opposes the change or cause that produces it.

Optics, Describe the formation of Newton''s rings.

Describe the formation of Newton''s rings.

Write the full form of esr, Mention two salient features of immunity theory...

Mention two salient features of immunity theory of ageing. Write the full form of ESR. What does the increase in ESR indicate?

What is the momentum of box when newtons acts on the box, A box is initiall...

A box is initially at rest on a horizontal, frictionless table. If a force of 10 Newtons acts on the box for 3 seconds, what is the momentum of the box at the end of the 3 second i

Velocity, initial acceleration rocket is 0.01t in upward dirction initioal ...

initial acceleration rocket is 0.01t in upward dirction initioal velocity is 50ms-1 , what is the function for the velocity of the rocket?

What is the electric field in that region of space, Regard as a volume of s...

Regard as a volume of space in which the electric potential is 125,000 volts (at every point in the volume of space) and what is the electric field in that region of space? Ans

Evaluate simple harmonic motion, Evaluate simple harmonic motion A simpl...

Evaluate simple harmonic motion A simple pendulum is 2.00 m long. (a)   What is the period of simple harmonic motion for this pendulum if it is hanging in an elevator acceler

Magnetic material, If the material is in the crystalline form, how will the...

If the material is in the crystalline form, how will the susceptibility be affected?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd