Warm Up 3: Energy Sublevels LT I can write electron configuration for any atom on the Periodic Table.
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1 Warm Up 3: Energy Sublevels LT I can write electron configuration for any atom on the Periodic Table. Q1. What are the four different energy sublevels? Q2. How many orbitals can fit in each energy sublevel, how many electrons can fit in each sublevel?
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3 Warm Up 3: Energy Sublevels Q1. What are the four different energy levels? A1. s,p, d, and f (rarely going to talk about f) Q2. How many orbitals can fit in each energy level, how many electrons can fit in each? A2. s =1 orbital = 2 electrons p = 3 = 6 electrons d = 5 = 10 electrons f = 7 = 14 electrons
4 Notes 1: Electron configurations 3 Rules in making electron configurations 1) Aufbau principle Electrons occupy the orbital of lowest energy first. Draw figure 5.5 like filling a glass of water, the lower levels will fill first.
5 Notes 1: Electron configurations Rule 2) Pauli exclusion principle -there are 2 electrons per orbital -electrons in the same orbital spin in opposite directions -to represent direction we use or Rule 3) Hund's rule -we fill as many orbitals with electrons going the same direction first -then we fill the orbitals with electrons spinning in the opposite direction.
6 Notes 1: Electron Configuration Example: What is electron configuration for O 1) How many electrons are in O 8 2) What levels/sub-levels will be filled first? 1s 2s 2p 3) How many electrons in each orbital 1s 2 2s 2 2p 4 4) How do we signify direction of the electrons? 1s 2 2s 2 2p 4 Please notice the superscript add up to # of electrons
7 Silent Reading min Be able to answer this question: What is an Electron Configuration? Electron Configuration: Distribution of -Every Energy Level -Every Sub Level -Every Electron in each Sub Level
8 Practice Problems 2 min and we will go over in class p.136 # 8a 8b 8c
9 What do we notice about the electron configuration and periodic table? -think about periods (rows) and Energy Levels -think about groups of families (groups or columns) and the sub levels. 2 min, discuss with table partners
10 Electron Configuration and Periodic Table S Orbitals 1s 2s 3s 4s 5s 6s 7s 3d 4d 5d 6d d Orbitals 2p 3p 4p 5p 6p 7p p Orbitals
11 Electron Configuration and Periodic Table HW 2 Corrections S Orbitals 1s 1 1s 2 n = energy level, 1,2,3,4,5,6,7 s,p,d,f = sub level (orbitals) superscript 3 = number of electron in that sub level d Orbitals p Orbitals 2s 1 2s 2 2p 1 2p 2 2p 3 2p 4 2p 5 2p 6 3s 1 3s 2 3p 1 3p 2 3p 3 3p 4 3p 5 3p 6 4s 1 4s 2 3d 1 3d 2 3d 3 3d 4 3d 5 3d 6 3d 7 3d 8 3d 9 3d 10 4p 1 4p 2 4p 3 4p 4 4p 5 4p 6 5s 1 5s 2 4d 1 4d 2 4d 3 4d 4 4d 5 4d 6 4d 7 4d 8 4d 9 4d 10 5p 1 5p 2 5p 3 5p 4 5p 5 5p 6 6s 1 6s 2 5d 1 5d 2 5d 3 5d 4 5d 5 5d 6 5d 7 5d 8 5d 9 5d 10 6p 1 6p 2 6p 3 6p 4 6p 5 6p 6 7s 1 7s 2 6d 1 6d 2 6d 3 6d 4 6d 5 6d 6 6d 7 6d 8 6 d 9 6d 10 7p 1 7p 2 7p 3 7p 4 7p 5 7p 6
12 Exceptions Keep in mind that the correct increasing energy level is: 1s 2s 2p 3s 3p 4s 3d not 1s 2s 2p 3s 3p 3d 4s, as written in the book Take 3 minutes and reread p137, why is the first configuration wrong
13 Warm Up 3: Energy Sublevels Q1. What are the four different energy levels? Q2. How many orbitals can fit in each energy level, how many electrons can fit in each? Q3. When writing out electron configurations, does the energy level always increase in numbers or will it ever decrease? Q4. What is the electron configuration for Boron?
14 Warm Up 3: Energy Sublevels Q3. When writing out electron configurations, do we write the numbers and orbitals in correct increasing energy? A3. NO, we write 3d before 4s, but 4s has lower energy than 3d. Q4. What is the electron configuration for Boron? A4. 1s 2 2s 2 2p 1 1s 2 2s 2 2p 4
15 p. 136: 8 &9 p. 152: HW 3: electron configuration Online Textbook Go to Chem Links and click on Online Textbook Unser Name = First Initial, Last Name, Zero, Zero ex. glemay00 Password = ID plus initials ex gl
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