GCHEM 111

  1. protons
    • positive
    • mass= 1.672623 x 10-24¬†g
    • relative mass= 1.007 atomic mass units (u)
  2. electrons
    • negative
    • relative mass = 0.0005 u ( not usually counted because they are so light)
  3. neutrons
    • no charge
    • mass= 1.009 u
  4. atomic number 
    "Z"

    • main number
    • order in periodic table
    • not weight!
    • is the number of protons and electrons¬†
  5. atomic weight/mass
    protons + neutrons
  6. standard=
    carbon
  7. isotopes
    atoms of same element, but different mass number
  8. average mass=
    atomic weight
  9. if you change the mass number you change...
    the number of neutrons
  10. numbers in the periodic table in terms of mass are not....
    exact they are averages
  11. finding atomic weight with isotopes
    (% of isotope 1)(mass) + (% of isotope 2)(mass)= average weight
Author
akcinloor
ID
175152
Card Set
GCHEM 111
Description
chapter 2
Updated