Atoms & Molecules.

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Presentation transcript:

Atoms & Molecules

Atoms- the building blocks of matter

Nucleus- center of atom Parts of an Atom Nucleus- center of atom Protons- positive charge (+) Neutrons- neutral charge (0) Electrons- negative charge (-), move around the nucleus

Elements Pure Substances- made of only one kind of atom # of Protons = Element on the periodic table

Molecules Two or more atoms combined In a chemical formula, the number of atoms comes after the symbol Example CO2 is 1 Carbon atom and 2 Oxygen atoms

Compounds Substance made of one or more elements.