1. THE

2. Atoms contain a nucleus, which is surrounded by electrons
Electrons orbit the nucleus
Structure of the Atom

3. Subatomic Particles
The atom can further be divided into three subatomic particles
1. Proton (positive charge) +1
2. Neutron (neutral charge) 0
3. Electron (negative charge) -1
Nucleus is composed of Protons AND Neutrons

4. Elements and Atoms Elements are compose of only 1 type of atom
All atoms with the SAME number of protons

5. Isotopes
Isotopes are atoms of the SAME element (aka same # of protons), BUT have different # of neutrons
Variation in abundance of an isotope makes up the relative atomic mass

6. Element Symbol Shows the chemical symbol (abbreviation)
ALWAYS 1 upper case letter followed by a lower case letter
Shows atomic number (# of protons)
Shows atomic mass (# of protons + neutrons)
Shows charge (if not charge, neutral)

8. Charged Atoms
Depending on the # of electrons and protons, atoms may be charged
Typically loss, or gaining of an electron
Protons can not be loss or gained. WOULD BE A NEW ELEMENT
Positively charged (+) = Cation
Negatively charged (-) = Anion
Neutral charge