2. No New Objective. Have homework out to be checked. Catalyst 11/3/10 Describe the mass/weight and charge (positive, negative, or neutral) of protons, neutrons and electrons.

3. Agenda Subatomic Particle Review (10) Ion and Isotope Notes/Practice (30) Homework: atoms, ions, and isotopes worksheet

4. Three Major Sub-Atomic Particles Protons Neutrons Electrons

5. THE PROTON p+p+ Fat (heavy) Positive (charge) Doesn’t move (lazy)

6. THE NEUTRON N°N°  Fat (heavy) Neutral  (charge) Doesn’t move (lazy)

7. THE ELECTRON Skinny (very light) Negative  (charge) Moves a lot (runs around) e-e-

8. the number of protons in an atom ATOMIC NUMBER (Z)

9. The total mass of all of the subatomic particles in an atom (but really # of protons and neutrons) ATOMIC MASS # (A)

10. Elements are electrically neutral. (They have the same # of p + and # of e - ) ELEMENTS

11. Atoms of the same element that differ in charge. (They have the same # of p +, but different # of e - ) IONS

12. If an atom GAINS electrons, its overall charge becomes more negative. If it LOSES electrons, its charge becomes more positive electrons = atomic number - charge

13. e = Z - charge Na + (lost 1 e - ) Ca 2+ (lost 2 e - ) Al 3+ (lost 3 e - ) Cl - (gain 1 e - ) O 2- (gain 2 e - ) P 3- (gain 3 e - ) 11-1= 10 e 20-2 = 18 e 13-3 = 10 e 17- (-1) =18 e 8-(-2) = 10 e 15-(-3) = 18 e Ions

14. Learning Check – Counting State the number of protons, neutrons, and electrons in each of these ions. 39 K + 16 O -241 Ca +2 198 20 #p + ___________________ #n o ___________________ #e - ___________________

15. Atoms of the same element that differ in mass. (They have the same # of p +, but different # of N°) ISOTOPE

16. Learning Check – Counting Naturally occurring carbon consists of three isotopes, 12 C, 13 C, and 14 C. State the number of protons, neutrons, and electrons in each of these carbon atoms. 12 C 13 C 14 C 6 6 6 #p + _______ _______ _______ #n o _______ _______ _______ #e - _______ _______ _______

17. Answers 12 C 13 C 14 C 6 6 6 #p + 6 6 6 #n o 6 7 8 #e - 6 6 6