particles c1
- Created by: faiqa1331
- Created on: 11-10-18 06:37
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- particles c1
- devoloping the atomic model
- 1803
- daltons solid atom
- electron discovered
- 1897
- thomson's plum-pudding model
- 1909
- ruhterford's planetary model
- mathematical model
- 1913
- bohrs energy level model
- proton then neutron discovered
- 1803
- the subatomic particles
- proton = 1 = +1
- neutron = 1 = 0
- electron = 0.0005 = -1
- the particle model
- particles are represented as hard spheres
- properties of a substance depend on its state
- solid
- very close together
- reguler arrangement
- vibrate around fixed position
- liquid
- close together
- randm arrangement
- move around each other
- gas
- far apart
- random arrangement
- move quickly in all directions
- limitations of the particle model
- model does not take into account
- forces between particles
- size of particles
- space between particles
- model does not take into account
- atomic structure
- isotopes
- atoms of an element with the different number of neutrons
- ions
- atoms that have gained or lost electron
- isotopes
- chemical and physical changes
- physical
- reversible
- no new substance are made
- chemical
- often difficult to reverse
- new substances made
- physical
- devoloping the atomic model
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