DAITON

        Dalton


John Dalton was born on September 6, 1766 into a Quaker family in Eaglesfield in Cumberland, England and died on July 27, 1844.

            His atomic theory said that elements consisted of tiny                        particles called atoms. It states an element is one of a kind                (aka pure) because all atoms of an element are identical. All            the atoms that make up the element have the same mass. All            elements are different from each other due to differing                      masses. A compound is a pure (one of a kind) substance due            to different
        
         A photo of John Dalton's atomic model
        elements bonded together. They are not easily separated from           one another. Compounds have a fixed ratio of atoms. Each              atom has its own characteristic weight, creating a weight ratio          between elements. Also, his theory said that chemical reactions        involve the rearrangement of combinations of atoms. His                  atomic theory stated the general information on the atom.                Everything is made of atoms. All atoms of different substances        have different weights.


                              


 His atomic theory said that elements consist of tiny particles called atoms. It states an element is one of a kind (aka pure) because all atoms of an element are identical. All the atoms that make up the element have the same mass. All elements are different from each other due to differing masses. A compound is a pure (one of a kind) substance due to different A photo of John Dalton's atomic model elements bonded together. They are not easily separated from one another. Compounds have a fixed ratio of atoms. Each atom has its own characteristic weight, creating a weight ratio between elements. Also, his theory said that chemical reactions involve the rearrangement of combinations of atoms. His atomic theory stated the general information on the atom. Everything is made of atoms. All atoms of different substances have different weights.




KEY POINTS

• Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.
• Dalton also stated that all compounds were composed of combinations of these atoms in defined ratios.
• Dalton postulated that chemical reactions resulted in the rearrangement of the reacting atoms.

TERMS

1. atom

               the smallest possible amount of matter that still retains its                  identity as a chemical element, now known to consist of a                nucleus surrounded by electrons

1. atomic mass unit

              the standard unit that is used for indicating quantity on a                    molecular (or smaller) scale


Click Here More Infornation
Click Here Theory
Click Here An Other Information..