Key Concepts of Chemistry-Part One
- Created by: asamsss
- Created on: 27-04-19 12:05
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- Chemistry-Part One; Key Concepts
- Atomic Models
- Dalton's Model:John Dalton confirmed that matter is made made up of atoms.He thought atoms were solid spherical balls like billiard balls. Dalton believed that there was nothing smaller than an atom
- Dalton's theory was quite similar to the Greeks:he believed that atoms could not be made or destroyed.
- Thomson's Plum Pudding Model
- Thomson discovered the electron.To explain why atoms had a neutral charge was because negative electrons were embedded in a solid positive sphere.
- Rutherford's Nuclear atomic model
- Rutherford's experiments showed that most of the atom was empty space and the small the nucleus contained positive particles called protons.
- He also said electrons surrounded the nucleus but did not know they were arranged in shells.
- Rutherford's experiments showed that most of the atom was empty space and the small the nucleus contained positive particles called protons.
- Dalton's Model:John Dalton confirmed that matter is made made up of atoms.He thought atoms were solid spherical balls like billiard balls. Dalton believed that there was nothing smaller than an atom
- Structure of an Atom
- Electrons negatively charged and relative mass is negligible or almost zero.
- Protons-positively charged particles and has a relative mass of 1
- Neutrons- zero charge or neutral and mass of one.
- Mass Number- number of protons PLUS number of neutrons
- Atomic Number- number of protons and electrons.
- Atomic Models
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