Unit 5 atomic stuctures Flashcard

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

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