chemistry
- Created by: willh3
- Created on: 21-11-18 15:05
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- Chemistry
- atomic structure
- all substances made from atoms
- what is a mixture
- easily separated and original properties unchanged
- sizes of subatomic particles
- proton = 1
- electron = 1/2000
- neutron = 1
- atoms are neutral as P=E
- protons/ positive are equal amount to electrons/ negative
- electrons on shell rules; 2,8,8,8
- number of neutrons = atomic mass - atomic/proton number
- proton number tells us the number of full shells of electrons.
- development of the atom
- before discovery of subatomic particles, believed atoms were indivisible
- plum pudding model = ball of positive charge with electrons embedded into it
- alpha particle scattering experiment
- nucleus was charged
- mass of atom is concentrated in the nucelus
- Bohr proposed that electrons orbit the nucleus
- Chadwick evidenced neutrons in nucleus
- development of periodic table
- old table ordered in RAM/weight
- what did Mendeleev contribute to PT
- left gaps
- changed order based on new RAM
- now ordered on atomic/proton number
- noble gases group 0
- full outer shell
- unreactive
- boiling point increases as you go down the group
- alkali metals group 1
- metal ion +1
- reactivity increases as outer electron is easily lost
- halogens group 7
- non metal ions -1
- reactivity decreases as gaining electron becomes harder
- group number = E on outer shell
- atomic structure
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