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?

Determine electric field inside the capacitor, A constant potential differe...

A constant potential difference is applied across the plates of a parallel-plate capacitor. Neglecting any edge effects, the electric field inside the capacitor is: a) constan

Ultrasonic, industrial application of ultrasonic welding

industrial application of ultrasonic welding

Explain three series-connected resistors, A 12V battery is connected in a c...

A 12V battery is connected in a circuit having three series-connected resistors having resistances of 4 Ω,9 Ω and 11 Ω. Verify the current flowing through and the p.d. acr

Angular Momentum, In the experiment, under which of the following circumsta...

In the experiment, under which of the following circumstances is the angular momentum L of the movable puck NOT conserved? a) The net torque  = 0. b) The radius r is always perpen

Free electron theory and band theory of solids, Q. What is the dissimilarit...

Q. What is the dissimilarity between Free Electron Theory and Band Theory of solids? Answer:- The Free Electron Theory This theory notifies that metals conduct electric

What is the slit separation, Light with a wavelength of 454.5 nm passes by ...

Light with a wavelength of 454.5 nm passes by two slits that are 95.2 cm from a screen. The distance among the centers of the central band and the first-order band is 15.2 mm.

State hooke''s law, Hooke's law is valid for only little deformation. Hook...

Hooke's law is valid for only little deformation. Hooke's principle describes that the extension produced in the wire is directly proportional to the load applied within elastic l

Can an ordinary diode be used as a zener diode, Can an ordinary diode be us...

Can an ordinary diode be used as a zener diode? Justify your answer. Ans Ordinary diode can't be used as a Zener diode, since ordinary diodes aren't operated  in  the  rever

Muslinbag., what is a muslin bag in electric..

what is a muslin bag in electric..

Two elementary particles which have infinite life units, Name any two eleme...

Name any two elementary particles which have almost infinite life time? Electron and proton have almost infinite life time.

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