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Unit 5 atomic stuctures
Unit 5 atomic structures
17
Chemistry
10th Grade
11/04/2009

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Term
Proton
Definition
~positive
~atomic #= # protons
~located in nucleus
~responsible for mass of atom
~identifies element
Term
Electron
Definition
~negative charge
~has smallest relative mass
~lost or gained when atom becomes an ion
~responsible for volume of atom
~located in electron cloud
Term
Neutron
Definition
~no charge
~located in nucleus
~responsible for mass of atom
~can be determined by subtracting atomic # of atom
Term
isotopes
Definition
different forms of same element-- different by mass
Term
Used in nuclear reactors
Definition
fission
Term
process found in the sun
Definition
fusion
Term
breaks large atoms apart
Definition
fission
Term
two small atoms form a larger atom
Definition
fusion
Term
relative mass of proton
Definition
1
Term
relative mass of neutron
Definition
1
Term
relative mass of electron
Definition
Term
protons=?
Definition
electrons
Term
atomic mass=?
Definition
p+n
Term
Gama
Definition
~high energy electromagnetic radiation
~0/0 Y
~charge-0
~not completely blocked by lead or concrete
Term
Beta
Definition
~-1
~0/-1 B
~blocked by metal foil
Term
alpha
Definition
~helium nuclei
~4/2 He
~charge=2
~blocked by paper
Term
isotope notation
Definition
mass number over atomic number x element
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