2. ++ + + Protons - positive charge Neutrons - no charge - - - Nucleus - Electrons negative charge 1st energy level holds a maximum of 2 electrons (e 1- ) 2nd energy level holds a maximum of 8 (e 1- )

3. 3 Atomic number # of protons (p 1+ ) 6 Mass Number # of protons + number of neutrons Li Symbol

4. ++ + Nucleus 3p 1+ 3n 0 2e 1- 1e 1- Shortform for 6 Li 3

5. 7p 1+ 8n 0 2e 1- 5e 1- Bohr Diagram N 7 Isotope notation 15

6. 6p 1+ 8n 0 2e 1- 8e 1- Bohr Diagram Isotope notation The charge compares proton number to electron number C 6 14 4-

7. 10 p 1+ 12n 0 2e 1- 8e 1- Bohr Diagram Isotope notation Ne 10 22

8. 12 p 1+ 16n 0 2e 1- 8e 1- Bohr Diagram 0e 1- Mg 12 28 2+ Isotope notation

9. 16 p 1+ 19 n 0 2e 1- 8e 1- Bohr Diagram Isotope notation 8e 1- S 16 35 2-

10. 15 32 P 3- The Bohr Diagram is 2e 1- 8e 1- 15 p 1+ 17 n 0

11. 19 40 K 1+ The Bohr Diagram is 2e 1- 8e 1- 19 p 1+ 21 n 0

12. 14 30 Si 2+ The Bohr Diagram is 2e 1- 8e 1- 2e 1- 14 p 1+ 16 n 0

13. 9 19 F 1- The Bohr Diagram is 2e 1- 8e 1- 0e 1- 9 p 1+ 10 n 0

14. O 18 3+ 8 Draw Bohr Diagrams for the following Na 25 1+ 11 Ca 44 2+ 20 N 17 3- 7 29 4+ 14 Si Na 25 3+ 11 Ca 46 3+ 20 N 19 1- 7 31 2+ 14 Si Ti 47 4+ 22 B 10 3- 5 31 1+ 14 P (a)(b)(c)(d) (e)(f)(g)(h) (i)(j)(k)(l)

15. 2e 1- 8e 1- 7e 1- 17p 1+ 19 n 0 2e 1- 8e 1- 5e 1- 15p 1+ 18 n 0 Isotope Notation is (m) (n)

16. 2e 1- 8e 1- 20p 1+ 23 n 0 2e 1- 8e 1- 21p 1+ 25 n 0 Isotope Notation is (o) (p)

17. 2e 1- 8e 1- 1e 1- 11p 1+ 15 n 0 2e 1- 8e 1- 0 e 1- 8 p 1+ 13 n 0 Isotope Notation is (q) (r)

18. 2e 1- 8e 1- 0 e 1- 6 p 1+ 9 n 0 2e 1- 8e 1- 0 e 1- 7 p 1+ 12 n 0 Isotope Notation is (s) (t)

19. 2e 1- 0 e 1- 5 p 1+ 7 n 0 2e 1- 8e 1- 0 e 1- 13 p 1+ 16 n 0 Isotope Notation is (u) (v)