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Tuesday, 31 July 2012

Atomic Spectra

Bohr model has its ability to predict the spectra of light emitted by atoms. In particular, its ability to explain the spectral lines of atoms as the absorption and emission of photons by the electrons in quantized orbits.

 Courtesy: http://abyss.uoregon.edu

Monday, 30 July 2012

Nuclear Fission and Fusion

Top: Uranium-235 combines with a neutron to form an unstable intermediate, which quickly splits into barium-144 and krypton-89 plus three neutrons in the process of nuclear fission. Bottom: Deuterium and tritium combine by nuclear fusion to form helium plus a neutron.
© Merriam-Webster Inc.

Courtesy: http://www.britannica.com

Sunday, 29 July 2012

Filtration

Filtration into a Conical Flask

Courtesy: Ken Partridge

Saturday, 28 July 2012

Titration


Courtesy: Dr. Mike Thompson

Friday, 27 July 2012

Changes of States


Courtesy: Chris Evans, QEGS Blackburn

Thursday, 26 July 2012

Mole-Box Diagram


Courtesy: Dr. Mike Thompson

Wednesday, 25 July 2012

Generate Quantum Numbers

Do you want to generate quantum numbers for an electronic configuration? Click on Quantum Number Primer below. It's an excellent illustration.


Courtesy: http://www.shsu.edu

Tuesday, 24 July 2012

The Elements


Courtesy: http://elements.wlonk.com/ElementUses.htm?_notoolbar

Monday, 23 July 2012

Periodic Table of Elements

You can find an excellent description of Modern Periodic Table of Elements with orbitals, properties and isotopes information here.

Courtesy: http://www.ptable.com/

Saturday, 21 July 2012

Halogens

Courtesy: http://www.physchem.co.za

Chalcogens

Courtesy: http://www.physchem.co.za

Friday, 20 July 2012

Inert Gases

Courtesy: http://www.physchem.co.za

Thursday, 19 July 2012

Mendeleev’s Periodic Table

Mendeleev’s table as published in 1869, with many gaps and uncertainties
Courtesy: http://www.aip.org/history/curie/periodic.htm

Evolution of Atomic Theory

Courtesy: http://www.scienceclarified.com

Wednesday, 18 July 2012

Alkaline Earth Metals


Courtesy: http://www.physchem.co.za

Tuesday, 17 July 2012

Elements in the Human Body

Elemental composition of human body
Courtesy: The University of Waikato

Sunday, 15 July 2012

Born Haber Cycle for NaCl

 Courtesy: Dr. Mike Thompson

Group 1 - Alkali Metals

Group 1 elements
Courtesy: http://www.learner.org/interactives/periodic/

Alpha, Beta and Gamma rays deflection

Courtesy: http://www.tutorvista.com

Wednesday, 11 July 2012

X-ray Radiation

X-rays are produced as a result of changes in the positions of the electrons orbiting the nucleus, as the electrons shift to different energy levels. 


Courtesy: University of Michigan, Student Chapter of the Health Physics Society

Tuesday, 10 July 2012

Mole Concept

Courtesy: http://aphschem.blogspot.in

Monday, 9 July 2012

Van Arkel Triangle

Courtesy: Dr. Mike Thompson

Sunday, 8 July 2012

Formation of Beryllium Chloride



Courtesy: Chris Evans, QEGS Blackburn

Saturday, 7 July 2012

Elemental composition of the Earth's surface

Elemental composition of the earth’s surface [includes the crust, oceans and atmosphere].
  • Oxygen                               49.1%
  • Silicon                                26.1%
  • Aluminum                           7.5%
  • Iron                                      4.7%
  • Calcium                               3.4%
  • Sodium                                2.6%
  • Potassium                            2.4%
  • Magnesium                          1.9%
  • Hydrogen                           0.88%
  • Titanium                            0.58%
  • Chlorine                             0.19%
  • Carbon                               0.09%
  • All others                            0.56%

Orbital Box Diagram

Electron filling in atomic orbitals following Aufbau principle [or building-up principle], Pauli exclusion principle [or Antisymmetry principle] and Hund's rule of maximum multiplicity.

Courtesy: Richard C. Banks, Professor of Chemistry, Boise State University.

Friday, 6 July 2012

Solvay Congress of 1927

The most famous conference held on October 1927, Fifth Solvay International Conference on Electrons and Photons, where the world’s most notable physicists met to discuss the newly formulated quantum theory. 

Thursday, 5 July 2012

Set of 3d orbitals

Courtesy: Dr. Mike Thompson

Wednesday, 4 July 2012

Atomic Orbitals

1 S orbital

P orbital


Courtesy: Chris Evans, QEGS Blackburn

Tuesday, 3 July 2012

Higgs boson buzz hits new high

Higgs boson buzz hits new high


 Proton on proton collision in the Large Hardon Coliider's 
ATLAS detector with four muons indicated by red tracks
 Courtesy: Alan Boyle (http://cosmiclog.msnbc.msn.com/)

Stern-Gerlach Experiment


Stern-Gerlach Experiment
Click to Run

Courtesy: PhET Interactive Simulations, University of Colorado,
                http://phet.colorado.edu/

Monday, 2 July 2012