1. Science Olympiad

2. Science Fair Judges Recruit judges for the Science Fair Judges must be +21 years old Judges must have a background in science – College students majoring in science – Engineers

3. Ions

4. 1. Fill in the table. Metal or Nonmetal Is the number of protons the same in the atom and the ion? Is the number of neutrons the same in the atom and the ion? Is the number of electrons the same in the atom and the ion? Charge on the ion Lithiummetalyes no1+ Magnesium metal yes no 2+ Aluminum metalyes no 3+ Fluorine nonmetal yes no1- OxygenNonmetalyes no2- Nitrogen nonmetal yes no 3-

5. 2. What distinguishes a neutral atom from an ion? Number of electrons 3. Where is the ion located on the isotope symbol? Upper right 4. Is charge indicated on neutral atoms? No.

6. Ions Ions are atoms that have lost or gained electrons. An atom that loses an electron becomes a positive ion (CATION) An atom that gains an electron becomes a negative ion (ANION) Charge of an ion = #protons - # electrons Mg 2+ Cl 1-

7. 7. Fill in table. Isotope Symbol Atomic Number38 1631 35 Mass Number 88 3270 80 # Protons 38 1631 35 # Electrons 36 182836 # Neutrons 50 1639 45 Cation or Anion cation anion cation anion