1. 2.3 The Periodic Table and Atomic Theory Pages 60-63 http://www.chemicalelements.com /index.html 1 By Lester Green Smallwood Academy Gambo

2. 1.20 Identify examples of common elements, and compare their characteristics and atomic structure. 2 Carbon Atomic Number 6 Atomic Mass 12 Oxygen Atomic Number 8 Atomic Mass 16 Fluorine Atomic Number 9 Atomic Mass 19 Neon Atomic Number 10 Atomic Mass 20

3. 1.21 Identify Energy Level First level 2 electrons Second level 8 electrons Third level 8 electrons Energy Levels 2,8,8 3

4. 1.21 continued… 1 st energy level ---2 electrons--- 2 nd energy level ---8 electrons--- 3 rd energy level ---8 electrons--- 4 Helium Neon Argon

5. 1.20.2 Define valence energy level. The outermost energy level of electrons around the nucleus of an atom 5

6. 1.20.3 Define valence electrons. The outermost electrons around the nucleus of an atom Also known as Valence Number Oxygen Valence Number 6 Carbon Valence Number 4 6

7. 1.20.3 continued… 7

8. 8

9. 1.20.4 Draw Bohr-Rutherford diagrams for elements 1 to 18 (20) Worksheet: Draw Bohr-Rutherford Models 9

10. 1.20.5 Identify the maximum number of electrons which exist in the first three energy levels. 10 First energy Level 2 electrons Second energy level 8 electrons Third energy level 8 electrons

11. 1.21 Interpret patterns and trends, and explain relationships among variables. 11

12. 1.21.1 Make comparisons of energy level diagrams for elements from the same family or group 12