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7 terms

7th grade science - Atoms, Molecules and Elements

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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)