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?

Describe the working of ultrasonic pulse echo system, Describe the working ...

Describe the working of ultrasonic pulse echo system. The working of ultrasonic pulse echo system: The ultrasonic pulse echo system is utilized to detect flaw, estimate the

To find velocity of spacecraft and acceleration, find acceleration of space...

find acceleration of spacecraft will changed during journey and velocity and displacement if formula for displacement " s " and velocity V S=ut +1/2 at.... (t to power 2) V= u+at

What is free fall acceleration, What is free fall acceleration? On eart...

What is free fall acceleration? On earth free fall acceleration is 9.81 meters per second per second or 32.2 feet per second per second, not containing air resistance. Aroun

Force on rocket repulsion, a jet of engine on a test tube takes in 20kg of ...

a jet of engine on a test tube takes in 20kg of air per second at a velocity of 100m/s and burns 0.8kg of fuel per second.after compression and heating the exhaut gases are ejected

Angle calculate by a body be projected, At what angle should a body be pr...

At what angle should a body be projected with a given velocity 24m/s just to pass over the obstacle 14m high at a given distance of 24m. Solution:   14=24xtan(θ)-(g*)(24 2

Explain fitting and fixture, Explain fitting and fixture. In the indust...

Explain fitting and fixture. In the industry, all terms are used indistinctly and frequently together. Several manufacturers describe fittings as the fixing elements, as connec

Quantam mechanics, what is the physical significance of Compton effect?

what is the physical significance of Compton effect?

Oscillation, motion of particle by to shm

motion of particle by to shm

Magnus effect, Magnus effect: In a moving fluid a rotating cylinder dr...

Magnus effect: In a moving fluid a rotating cylinder drags some of the fluid around with it, in its direction of rotation. This enhances the speed in that region, and therefor

Water drain counter clockwise in the northern hemisphere, Q. Illustrate tha...

Q. Illustrate that water drain counter clockwise in the northern hemisphere and clockwise in the southern hemisphere? Answer:- This isn't a myth. It drains counter clockwi

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