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  • Created by: keyaan111
  • Created on: 18-04-16 17:51

Atoms structure

Heres a diagram of an atom

 

           

                                   Charge                                                  Relative mass

Proton                           +1                                                              1

Neutron                         0                                                                1

Electron                         -1                                                               1/1835 or neligable       

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Dalton view

Understanding of atoms didn’t progress much beyond Demokritos’ theory until the English chemist John Dalton (1766 - 1844) started to look at it in the 1800s. Dalton did experiments, worked out some atomic weights, and invented symbols for atoms and molecules. His most important conclusions are summarised below.

all matter is made of atoms, and atoms are indestructible and cannot be broken down into pieces

all the atoms of a particular element are identical to each other and different from the atoms of other elements

atoms are rearranged in a chemical reaction
compounds are formed when two or more different kinds of atoms join together

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