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 magnetic susceptibility, It is the property of the substance which...

It is the property of the substance which defines how easily a substance  can be magnetized. It may also be defined as the ratio of intensity of magnetization (I) in a substance to

Relative maximum in intensity, A pair of speakers separated by 0.700 m are ...

A pair of speakers separated by 0.700 m are driven by the same oscillator at a frequency of 688 Hz. An observer, originally positioned at one of the speakers, begins to walk along

Vectors, The helicopter view in fig. p3.29

The helicopter view in fig. p3.29

Explain slip-ring, Explain Slip-ring Slip-ring (or phase- wound)  ro...

Explain Slip-ring Slip-ring (or phase- wound)  rotor having of a slotted laminated core of sheet steel. A three- phase winding is placed in the rotor slots. The rotor windin

Explain the ray diagrams for mirrors, Explain the Ray Diagrams for Mirrors?...

Explain the Ray Diagrams for Mirrors? To figure out the position and size of an image reflected by a curved mirror, you can draw a scaled diagram of the mirror as follows: along

Simple harmonic motion i, Simple Harmonic Motion I Demonstrating in whi...

Simple Harmonic Motion I Demonstrating in which one component of uniform circular motion is simple harmonic motion.

Its hard 4 me, what is physics and how to learn it easlly?

what is physics and how to learn it easlly?

Electricity at a fundamental level, 1.    Explain the basic features of ele...

1.    Explain the basic features of electricity at a fundamental level? ( Describe the nature of electricity)   2.    What part of a cable are conductors and insulators? (Recogini

Kinematics, how much energy is required to raise an object of 300g that is ...

how much energy is required to raise an object of 300g that is initially at rest to a height of 2m and simultaneuosly give the object a velocity if 4m/s?

Spectrum, Show that the spectrum of thermal radiation for T ¼ 300K peaks at...

Show that the spectrum of thermal radiation for T ¼ 300K peaks at approximately 10 microns Minimum 100 words accepted

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