Tuesday, October 26, 2010

(DA) Oct. 26, 2010: Isotopes & Atoms

Atomic Number

  • Atomic Number: Number of protons
Atomic Number = 22
Symbol = Ti
Atomic Mass = 47.87

Atomic mass - Atomic Number = # neutrons
   (p+n)         -           (p)            =        (n)

Isotopes - Same atomic number but different mass

FOR EXAMPLE:

Isotope     Mass#     Atomic#    # of Protons    #of Neutrons
 54Fe          54             26                26                   28
 56Mn         56             25                 25                   31
237Np        237            93                 93                  144
  14C          14              6                   6                     8







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2 comments:

  1. Mr. DoktorNovember 4, 2010 at 7:26 AM

    How do you determine the atomic mass of an element from the data of a mass spectrometer?

    ReplyDelete
  2. AnonymousNovember 23, 2010 at 5:59 PM

    You multiply the mass by the percent.

    eg. 100g x 10% (0.1)

    = 10g

    ReplyDelete

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