Sunday, February 14, 2010
Structure of atom (part 1)
Posted on 6:18 PM by Mohamed Omar
Greek philosopher:
- All matter can be divided into smaller parts
- Each part can be subdivided into smaller parts and further into smaller one and so on until reaching undividable fragment called ATOM which means in Greek language (no divide)
- A = no
- TOM = divide
Aristotle:
- Matter composed of 4 elements:
- Fire: which is hot and dry
- Air is moist and warm
- Dust (earth): is dry and cool
- Water is cool and moist.
{A pure simple substance which can't be analyzed (or broken down) into simple one by normal chemical methods}
John Dalton:
- element are composed of very small particles called atoms
- The atoms can't be divided (indivisible particles)
- of the same element are identical (have the same mass)
- Atoms of one kind of element are different from the atoms of all other elements
- Compounds are made of molecules and formed by joining atoms in specific whole number ratio
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