chemistry

  • Created by: willh3
  • Created on: 21-11-18 15:05
View mindmap
  • 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

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Atoms resources »