7th grade science - Atoms, Molecules and Elements

7 terms by msanon 

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atom

-the basic building block of all matter
- made up of protons, neutrons, and electrons.

element

substance made entirely of one type of atom

molecule

a group of two or more atoms that are joined together.

compounds

Special type of molecule
- Made up of two or more elements.

atomic number

tells you how many protons and electrons are in an atom

atomic weight

-the number of protons + the number of neutrons

neutrons

Found inside the nucleus of an atom.
# of neutrons = (atomic number) - (number of protons)

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