2. WELCOME!! 1.Please be in your seats by the time the bell rings. 2.On your catalyst sheet write Monday, December 1st.

3. Please put up any electronic devices like cell phones/ear buds.

4. Give the valence electron number for Potassium, Beryllium, Carbon, and Neon. 5 MINUTES CATALYST

5. 4 MINUTES CATALYST Give the valence electron number for Potassium, Beryllium, Carbon, and Neon.

6. 3 MINUTES CATALYST

7. Give the valence electron number for Potassium, Beryllium, Carbon, and Neon. 2 MINUTES

8. CATALYST Give the valence electron number for Potassium, Beryllium, Carbon, and Neon. 1 MINUTE

9. TIME’S UP!!!!!

10. Catalyst Answer Give the valence electron number for Potassium, Beryllium, Carbon, and Neon. K: 1 Be: 2 C: 4 Ne: 8

11. AGENDA Catalyst Covalent Bond notes Hindenberg Disaster Clip Exit Slip

12. ANNOUNCEMENTS 1.See me for help. 2.Coming to class is critical next couple of weeks!!!!! 3.Final catalyst sheet of semester is worth 20 points. Not to be collected till December 12 th. 4.Assessment on Friday of this week.

13. TODAY’S OBJECTIVE Today you will be introduced to the properties of Covalent Bonds. HS-PS1-3: Investigate the electrical strength between particles.

14. Finding Valence Electrons Before delving into Ionic Bonds, lets remember how we find the valence electrons. There are two ways in which to find them. Either— By creating a Bohr diagram……… ……..or by looking at the group number on the PT. Groups 1 and 2 are easy. Each element valence number is the same as the group number. We skip transition metals. For groups 13-18, the valence # for each element corresponds to the second digit in each group. What is the valence electron number for Antimony? 5!!

15. Covalent Bonds The attraction that forms between atoms when they share electrons is known as a covalent bond. These always contain a two non-metals.

16. Covalent Bonds…… Unlike Ionic Bonds they have low melting points. They don’t conduct electricity because they don’t have free floating electrons. Still, they also can be explosive. The Hindenberg Blimp Disaster was caused by sparks from lightning in a thunderstorm it flew into upon landing. Sparks in fire contain oxygen. The iconic airship had reportedly become charged with static as a result of the electrical storm and broken wire or a sticking gas valve leaked the hydrogen into the ventilation shafts. This spark containing oxygen reacted with hydrogen to blow up the blimp.