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the atom
the smallest part of an element that still has properties of that element
subatomic particles
a particle found inside an atom
proton
positive charge, found inside the nucleus
neutron
neutral charge, found inside the nucleas
electron
negative charge, found inside in electron charge
atomic number
number of protons
mass number
number of protons + neutrons
periodic table
an arrangement of elements in order of increasing atomic number.
groups
vertical columns
periods
horizontal rows