chemm

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Author:
emilyyx14
ID:
112439
Filename:
chemm
Updated:
2011-10-26 21:03:23
Tags:
chem
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Description:
chem
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  1. what is an atom
    the smallest particle of an element that has a unique identity in a chemical reaction
  2. what parts of dalton's theory do we not believe to be true
    • atoms indivisible
    • not the same (different number of neutrons)
  3. describe 4 main points to early atomic theory
    • philosophers believed atoms were INDIVISIBLE & INDESTRUCTABLE
    • no scientific method at this part in time
    • good idea but no supporting data
    • early 1800's moved from ideas to scientific theory
  4. cathode ray experiment
    • passed electric current through low pressure gas contained in tube
    • ray attracted to (+) charged plate and repelled (-)
  5. describe how electrons were discovered
    • ratio charge: mass of particles
    • ratio same every element
  6. why did scientists begin to look for a positive particle
    • charges were always whole numbers
    • there was a neutral charge
    • had to balance out negative charge
  7. what kind of particles found in nucleus
    subatomic particles
  8. plum pudding model
    • electrons are like plums evenly distributed throughout
    • protons are the pudding, lump of positive charge
  9. nuclear model of atom
    tiny central core of atom composed of protons and neutrons
  10. 6
    Li
    3
    • neutrons: 3
    • protons: 3
    • electrons: 3
  11. 7
    Li
    3
    • neutrons: 4
    • protons: 3
    • electrons: 3
  12. atomic #
    # of protons
  13. mass #
    # of protons + # of neutrons
  14. isotopes
    • atoms with the same number of protons but different number of neutrons
    • same atomic number
    • different mass number
  15. why do isotopes behave the same chemically
    protons & electrons are responsible for chemical behavior and they are always the same
  16. how to calculate atomic mass
    [(% abundance as decimal)*mass]
  17. group
    • column
    • elements in a group have similar chemical & physical properties
  18. period
    • row
    • properties vary as you move across a period, but there's a pattern of properties that repeats
    • *%#
    • *%#
    • *%#

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