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Atoms
vocabulary
8
Science
9th Grade
09/15/2009

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Term
atom
Definition
the smallest partical of an element
Term
proton
Definition
a subatomic particle found in the nucleus with a positive charge
Term
neutron
Definition
a subatomic particle found in the nucleus with no charge
Term
electron
Definition
a subatomic particle with negative charge found round the nucleus in a electron cloud
Term
periodic table
Definition
system of organization of the elements according to repeating properties
Term
atomic number
Definition
the number of protons in the nucleus
Term
mass number
Definition
the total number of protons and neutrons in the nucleus of a specific  atom
Term
average atomic mass
Definition

the average of the mass numbers

 of the isotopes if an element based on how common the isotope is

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