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2. Solid Sphere Model

posted Oct 5, 2010, 10:26 PM by Raymond Cen   [ updated Dec 15, 2011, 5:19 PM ]
Solid Sphere Model


Who theorized the Solid Sphere Model?
John Dalton (1766-1844)

Who else but John Dalton? Dalton lived from September 6, 1766 to July 27 1844. He was born into a Quaker family at Eaglesfield near Cumberland, England. He was a dissenter and was therefore prohibited from attending or teaching at English schools. Dissenters were Christians who separated from the Church of England. His theory about an atom was the solid sphere model. An interesting fact was that he himself was color blind and due to his research into color blindness, Daltonism became a term for color blindness.

What is the Solid Sphere Model? 

Dalton said that particles were made of atoms that could not be split apart, created, or destroyed. Atoms of the same element were identical in size, mass, and other properties while atoms that weren’t of the same element differed in these properties. To form a compound you had to combine two or more kinds of elements. Also, a chemical reaction was the atoms combining, separating, or rearranged. He also proposed another theory, the “rule of greatest simplicity.” This “rule” said that if two elements formed a compound in a one to one ratio then the compound only had two atoms each from a different compound. Due to his rule, this is why he assumed water to be HO and not H2O as we know it today. 

Conclusion:
-Atoms were tiny spheres that were indivisible
-Matter is not created or destroyed in chemical reactions

Click 3. Plum Pudding Model and we'll head to England to see the next scientific discovery!

The scientist, by the very nature of his commitment, creates more and more questions, never fewer.  Indeed the measure of our intellectual maturity, one philosopher suggests, is our capacity to feel less and less satisfied with our answers to better problems.  ~G.W. Allport, Becoming, 1955