CHAPTER 1 ATOMS AND ELECTRONS SEMESTER1

 

 


PERIODIC TABLE (LINK)


THE SYMBOLS OF ELEMENTS PROPOSED BY JOHN DALTON
John Dalton

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JJ Thomson




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Ernest Rutherford


RUTHER FORD' S ALPHA PARTICLE SCATTERING EXPERIMENT


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Rutherford's atom model
 
 
Niels Bohr




 

Shapes of orbitals

QUESTIONS


1.How  many electrons can be kept in    a. 2s sub-shell   b. 3d sub-shell

2.Why did Rutherford only take gold foil to bombard alpha rays?

3.Draw a sketch diagram showing the relative energies  of the 1s,2s,2p,3s,3p,4s and 4p sub-shells.


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SUCCESSIVE IONIZATION ENERGY

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LASER


LASER IS  Light amplification by stimulated emission of radiation.


Luminescence

The electrons in some substances absorb energy then emit light. This  is called luminescence.









 
 Atoms and Electrons

http://www.mhhe.com/physsci/chemistry/carey/student/olc/ch01atoms.html

 http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/atomic/atomstrucrev1.shtml

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