Cm Element of the Day Curium (kewreeәm) is a transuranic radioactive chemical element with the symbol Cm and atomic number 96. This element of the actinide series was named after Marie Curie and her husband Pierre Curie both were known for their research on radioactivity. Most curium is produced by bombarding uranium or plutonium with neutrons in nuclear reactors – one ton of spent nuclear fuel contains about 20 grams of curium. Curium is a hard, dense, silvery metal with a relatively high melting point and boiling point for an actinide. Curium readily oxidizes, and its oxides are a dominant form of this element. When introduced into the human body, curium accumulates in the bones, lungs and liver, where it promotes cancer. All known isotopes of curium are radioactive and have a small critical mass for a sustained nuclear chain reaction. Curium is used in production of heavier actinides and of the 238­Pu radionuclide for power sources in artificial pacemakers. It served as the α source in the alpha particle X­ray spectrometers used to analyze rock composition. Curium's outer electrons have a principal quantum level of four. How many electrons may fit into this orbital? 1 Chemistry 1. Warm­Up ­5 2. Review Book Homework ­10 3. Notes­ 20 4. Complete POGIL Activity ­30 5. Test Review ­20 Announcements Due Today: Mole Airlines Extra Credit Due Today: Read pages 317 to 331 and answer questions 1 ­ 9 odd, 15, 17, 19 and 25. Begin work on Study Guide! ­ Will be available after school today. Semester Review Session Thursday at 3:00 pm 2 Homework Review 3 POGIL Activity with Modeling Kits! ­ Turn in 4 Review/Notes 5 Quantum Numbers ­ Review Questions 1. List the four quantum numbers in order? 2. The how many electrons may fit into the second principal quantum level? 3. Sketch the periodic table showing s, p, d, and f blocks. Which quantum number does this relate to? 6 f. electronegativity For each of the following compounds, choose the bond that will be more polar. a. H­P or H­C b. H­S or H­F g. dipole moment 7 Lewis structures In almost all stable chemical compounds of the representative elements, all of the atoms have achieved a noble gas electron configuration. Lewis structure: Octet rule: Lone pairs: Examples of Lewis structures 1. H2O 2. NH3 3. CO2 8 VSEPR Model Steps for predicting Molecular Structure Using the VSEPR Model 1. 2. 3. 4. Example 9 More Lewis Dot Structure Practice 1. Hydrogen Peroxide (H2O2). 2. Carbon tetrachloride (CCl4) 3. Fluorine gas 4. Ethanol (C2H5OH) 10 Exit Question How many electrons can fit in the 3d orbital? Reminder(s) Due Today: Read pages 317 to 331 and answer questions 1 ­ 9 odd, 15, 17, 19 and 25. Begin work on Study Guide! ­ Will be available after school today. Semester Review Session Thursday at 3:00 pm 11.