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Atom
Basic unit of matter
Nucleus
Center of atom
Electrons
Move in constant motion
Element
Pure substance with one type of atom
Atomic Number
Number of protons
Isotopes
Same element, different neutrons
Compound
Substance formed by combining two or more elements
Atoms are held together by what chemical bonds
Ionic bonds, covalent bonds, van der waals forces
Ionic bonds are formed
When electrons are transferred, and the attraction between oppositely charged ions
Covalent bond
Electrons are shared between atoms, and can form single double or triple bonds
Van der waals forces
Weak attraction between molecules caused by slight positive or negative charges