1. Monday October 22, 2012 (WS - Valence Electrons and Electron Configuration)

2. Bell Ringer Monday, 10-22-12 What two pieces of information are needed in order to calculate the average atomic mass number of any element on the Periodic Table. the mass numbers of the different isotopes of the element the relative abundance (%) of each of the isot0pes.

3. Announcements

4. Assignment Currently Open Summative or Formative? Date IssuedDate Due Date Into GradeSpeed Final Day QUIZ 6S310/5 10/26 QUIZ 7S410/12 10/26 Pop Quiz – The Periodic Table and the Periodic Law F410/16 WS – Average Atomic Mass F510/1810/2210/24 QUIZ 8S510/19 11/2

5. Chemical Bonding Unit 4

6. Two very important conditions for atoms are: electrical neutrality chemical stability All atoms that have equal numbers of protons and electrons are electrically neutral. However, only the Noble gases are also stable. All other atoms bond to form chemical compounds because that’s the way to become stable. … the runners on the outside lane of the track

7. In the process of bonding, atoms either lose, gain, or share their valence electrons. Remember that these valence electrons are those in the atoms’ outermost, highest energy level, and as a result are the ones most subject to the influence of other nearby atoms or ions.

8. In this chemistry class, we will deal primarily with valence electrons located in an atom’s highest energy level s- and p- sublevels. For example, the element sodium has an electron configuration notation of 1s 2, 2s 2, 2p 6, 3s 1 As you can see, sodium has only one electron in its highest energy level (3), and it’s in the s sub-level. This is the only electron sodium will use to bond.

9. Worksheet Valence Electrons and Electron Configuration