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atomic structure

Electrons

Smallest subatomic particle

First discovered

Found on the outside of the nucleus

negative electrical charge

responsible for chemical properties

Proton

located in atoms nucleus

Positive electrical charge

Neutrons

no charge

found in nucleus

Atomic Number

Always a whole number

number of protons is the atomic number

Atomic Mass

total number of particles in nucleus

to find neutrons you subtract atomic number from isotopes mass number