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Atom
the smallest component of an element having the chemical properties of the element is ___
proton
___a stable particle with positive charge
neutron
___an elementary particle with 0 charge and mass about equal to a proton
electron
___an elementary particle with negative charge
Isotopes
____ have same number of protons , different number of neutrons
Valence shell
___the outermost shell of an atom
Note
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