1. The Chemistry of Life Electron Configuration & practice with the Periodic Table

2. Draw the electron configuration for the following elements as they would appear on the periodic table. Then decide if it is stable Yes / No.

3. An atom with 3 electrons. Is it stable? No

4. An atom with 7 electrons. Is it stable? No

5. An atom with 18 electrons. Is it stable? Yes

6. An atom with 11 electrons. Is it stable? No

7. An atom with 2 electrons. Is it stable? Yes

8. An atom with 14 electrons. Is it stable? No

9. What numbers of valance electrons make an element stable? What numbers of valance electrons make an element want to be a positive ion? What numbers of valance electrons make an element want to be a negative ion? 8,2 1,2,3 5,6,7

10. Look at the element pictured below. Draw the element so that it is an isotope. Element Isotope 35 See same P and E but different N. 35

11. Periodic table and bonding… again 1. What is the symbol for Hydrogen? __________________________ 2. What element is W? _________________________ 3. What is the symbol for Sulfur? __________________________ 4. What period id Ar in? _________________________ What row? __________________________ H Tungsten S 18 3

12. 5. What element is O?___________________ Write how O appears in nature most often ________________ As it appears in nature is it a molecule or a compound? __________________ 6. What type of element is Fe? _____________________________________ 7. What is the atomic number of Gold? _____ The atomic mass? __________ How many Protons does it have? _____ Neutrons? _______ Electrons? _____ Oxygen O2O2 Molecule Metal (b/c it is Iron) 79 196.96 79 117 79

13. 8. How many valance electrons does Cesium have? ______________ 9. Will Carbon more likely form Ionic or covalent bonds? ______________ Explain your answer using the number of valance electrons it has. 10. Will Lithium more likely form Ionic or covalent bonds? ______________ Explain your answer using the number of valance electrons it has. 11. Will Hydrogen more likely form Ionic or covalent bonds?_________________ Explain your answer using the number of valance electrons it has. 1 Covalent It has 4 V.E. & it is hard to steal 4 more so it shares. Ionic loses 1 V.E. the next ring is full easier to lose 1 than get 7 Covalent loses its electron it will only be a proton so it shares.

14. Draw Ions Draw a representation of the 1+ ion for Lithium. Draw a representation of the 2- for Sulfur. Draw a representation of the 3+ ion for Aluminum. Li 1- s 2-s 2- Al 3+