Dalton’s Atomic Model
Transcript of Dalton’s Atomic Model
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Dalton’s Atomic Model
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John Dalton• September 7, 1766 – July 27, 1844• An English chemist, physicist and
meteorologist• One of the pioneers of the development of the
modern atomic theory• Daltonism – it is the concept of Dalton’s
research about color blindness
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John Dalton• In 1803, he published his first table on relative
atomic weights. He computed the atomic weights from the percentage composition of compounds
• He also contributed on Gas Laws
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John Dalton’s Atomic Theory1. Elements are made of extremely small particles called
atoms.2. Atoms of a given element are identical in size, mass,
and other properties; atoms of different elements differ in size, mass, and other properties.
3. Atoms cannot be subdivided, created, or destroyed.4. Atoms of different elements combine in simple whole-
number ratios to form chemical compounds.5. In chemical reactions, atoms are combined, separated,
or rearranged.
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BILLIARD BALL MODEL
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Billiard Ball Model• Dalton’s atomic model• Created in 1803• Represented as a tiny indivisible uniformly dense, solid
sphere• Elements are comprised by tiny particles called “atoms”• Atoms can’t be divided, destroyed or created• Atoms of two or more elements combine to form a
compound• Has no nucleus• Become the basis for future atomic model
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Billiard Ball Model• Atoms are of the same size and same
component as the element• Dalton thought that atoms are empty inside
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