1. The Atom and Its Parts Physical Science

2.  The three subatomic particles are:  Proton – Positive charge  Electron – Negative charge  Neutron – No charge or neutral Chemistry: Atomic Structure

3.  Molecule – Made of more than one atom. Can be the same type or different types of atoms Element – Molecule made of Only one type of atom Compound – Molecule made of different types of atoms Particles

4. Atomic Structure

5.  The atomic number tells you the number of Protons (+) Electrons (-) Atomic Number Remember, the atom’s positives and negatives must equal in order for it to be balanced or neutral.

6.  Use Atomic Mass and the Atomic Number to calculate the number of neutrons an atom has: Example:Boron Atomic number – 5 Atomic mass – 10.811 1.Round the atomic mass to the nearest whole number 2. Subtract the atomic number from the rounded number Boron has neutrons in the nucleus Atomic Mass 10.811 = 11 11 – 5 = 6 6