Make your own free website on Tripod.com







Quia.com












Home | Page Title





























































































periodictable.jpg

countingatoms.jpg

Naming a compound

 

1)    Write the name of the metal first & non-metal second

2)Change the ending of the non-metal to “ide”

 
 
 
 
Binary compounds – a bond between a metal and a non-metal. The metal gets rid of the extra electrons. The metal gets rid of the extra electrons while the non-metal gains the electron to come stable.

 

 

 

Bohr Diagrams

 

Atomic number = the protons and the electrons

Neutrons = the atomic mass minus the atomic number
 
 
 
Criscross Rule :
 
(a) Write the symbols of the elements. The metal (positive ion) is written first. The nonmetal (negative ion) is written second. (i.e.) K and S
 
(b) The charge of an ion is written with the number followed by a positive or negative sign. Use the combining capasity to determine the charge of the ions. Write the charge of the ion of each element above them.
 
(c) Crisscross the charges. Do not include the positive or negative signs when writing the final formula.
 
 
 

elements.jpg

0sumrule.jpg

  1. Dalton’s theory
    • John Dalton
    • 1808
    • invisible atoms
    • no protons
    • no electrons
    • no neutrons

 

  1. Thomson’s Theory
    • J.J Thompson
    • 1897 +
    • positive sphere with embedded electrons
    • net charge of zero
    • no protons
    • no electrons

 

  1. Nagaka’s Theory
    • H Nagaka
    • 1904
    • positive sphere with a ring of electrons
    • no protons
    • no neutrons

 

  1. Rutherford’s Theory
    • Ernest Rutherford
    • 1914
    • small positive nucleus surrounded by electrons
    • no neutrons

 

  1. Bohr’s Theory
    • Neils Bohr
    • 1921
    • magic numbers of electrons in quintile energy levels
    • explain periodic law

identify.jpg

identifycont.jpg

particle.jpg