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The Atom and Its Parts Physical Science Chemistry: Atomic Structure The three subatomic particles are: Proton – Positive charge Electron – Negative charge Neutron – No charge or neutral Particles 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 Atomic Structure Atomic Number The atomic number tells you the number of Protons (+) Electrons (-) Remember, the atom’s positives and negatives must equal in order for it to be balanced or neutral. Atomic Mass Use Atomic Mass and the Atomic Number to calculate the number of neutrons an atom has: Example: 1. Boron Atomic number – 5 Atomic mass – 10.811 Round the atomic mass to the nearest whole number 10.811 = 11 2. Subtract the atomic number from the rounded number 11 – 5 = 6 Boron has 6 neutrons in the nucleus