Notes
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a
X
z
x= element symbol
a= mass number
z= atomic number, number of protons
26
Al aluminum 13 electrons
13 13 protons 13 neutrons
mass number = protons AND neutrons in an atom
ISOTOPES: atoms with the same number of protons but different numbers of neutrons
atoms of the same element (same atomic number) but wiht different mass number
isotopes of chlorine
35Cl17 37Cl17
chlorine - 35 chlorine - 37
12C6 13C6 14C6
am: 12 13 14
p: 6 6 6
n: 6 7 8
e: 6 6 6
calculating average atomic mass
percent (%) abundance of isotopes
mass of each isoptope of that element
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