1. Atoms, Bonding and Periodic Table Important Stuff to Know!!!!

2. Valance Electrons & Bonding
The number of valance electrons in the outer shell of an atom determines its reactivity.
The number of valance electrons determines which elements it can bond with

4. What we learned from our Periodic Table Project

6. Chemical Bonds and Stability
• Atoms of most elements are more stable --- or less likely to react with other elements ---- when they have 8 valence electrons
• Octet rule -- atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same number of electrons as a noble gas.

7. Question… How many electrons does Hydrogen need to become stable?

8. Chemical Bonds and Reactions
When atoms bond with other atoms, electrons can be transferred from one atom to another
or they can be shared between atoms

9. Transferred electrons ---- ionic bonding

11. Shared electrons ---- covalent bonding

12. Electron dot diagrams
An atom’s valance electrons are shown as dots around the symbol of the element.
Called the Lewis dot or Electron dot structure of that element

13. Electron Dot

14. How many electrons does a carbon atom need to be a happy atom
How many electrons does a carbon atom need to be a happy atom? -- satisfy the octet rule?

15. Exit Card