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Chem Ch 2.txt
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3 particles in an atom:
Protons, Electrons, Neutrons
Protons
mass=1amu; Positive Charge;atoms of diff elements have diff # protons
Electrons
Negative Charge; 1 for each proton in all neutral atoms
Neutrons
mass=1amu; no charge(create stability in nucleus); atoms of a given element can have a variable #
Isotopes
atoms of a given element (same # protons) with diff # of neutrons
Each Isotope has
a mass number; the sum number of protons and neutrons
Atomic mass
the blended average weight of an element with isotopes
Aragadros Number
6.02x10^23 = 1 mole
1 mole
equal to the atomic mass in g of any element
molecular weight of a compound
the sum of the atomic weights of all the elements in the compound
72 -1
...Br
35
72=mass #
-1=charge
35=atomic number
How many neutrons with a mass of 72 and atomic number of 35?
37
How many electrons with a atomic number of 35 and charge of -1?
36
How many protons in an atomic number of 35?
Author
tmgordy
ID
33186
Card Set
Chem Ch 2.txt
Description
Chem Ch 2
Updated
2010-09-07T14:55:37Z
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