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?

Chlorine atom differs from chloride ion in the number of, Chlorine atom dif...

Chlorine atom differs from chloride ion in the number of: (1) Proton          (2) Neutron   (3) Electrons              (4) Protons and electrons Ans: Electrons

Describe construction and working of carbon dioxide laser, Describe the con...

Describe the construction and working of carbon dioxide laser. Construction and Working: The most fundamental form of a CO 2 laser comprise a gas discharge (along with a mi

Crystal growth, various techniques involved in crystal growth

various techniques involved in crystal growth

What are the applications of nmr spectroscopy, What are the applications of...

What are the applications of nmr spectroscopy? The major applications of NMR stereoscopy are the elucidation of the carbon-hydrogen backbone of organic compounds and the determ

SURFACE TENSION, WHY Surface tension increases when an highly soluble SUBST...

WHY Surface tension increases when an highly soluble SUBSTANCE is dissolved in water WHILE IT DECREASES WHEN an weakly soluble substance is dissolved in water

Dot product, Dot Product A Easy demonstration of the relation among the...

Dot Product A Easy demonstration of the relation among the dot product of 2 vectors and the angle among them. Move the slider to view the changes.

Avogadro constant, Avogadro constant; L; NA (Count A. Avogadro; 1811) T...

Avogadro constant; L; NA (Count A. Avogadro; 1811) The number of items in a sample substance is equivalent to the number of atoms or molecules in a sample of ideal gas that is

Illustrate briefly the significance of entropy, Illustrate briefly the sign...

Illustrate briefly the significance of entropy? Determine the work done when 2 mole of an ideal gas expands isothermally and reversible from 10 atm. To 2 atm. Pressure at 27 0 C

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