Warm Up 2: Energy Levels
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1 Warm Up 2: Energy Levels LT I can explain how the periodic table is organized around electron energy levels and sub levels. Q1. What is an electron cloud? Q2. What does "n" mean in reference to electron energy levels?
2 1 Warm Up 2: Energy Levels LT I can explain how the periodic table is organized around electron energy levels and sub levels. Q1. What is an electron cloud? A1. It is an area that you can find an electron. "orbital" Q2. What does "n" mean in reference to electron energy levels? A2. It is simply the Electron energy level, what we use to know as E.L. 1 = 2 electrons E.L. 2 = 8 electrons E.L. 3 = 8 18 electrons n = 1,2,3...7
3 LT I can explain how the periodic table is organized around electron energy levels and sub levels. Today's Goals Recall what electron energy levels are Learn how electrons form predictable "clouds" around the nucleus
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5 Atomic Orbitals The numbers and types of atomic orbitals depend on the principal energy level.
6 Shapes of different Atomic Orbitals For a given principal energy level greater than 1, there is one s orbital, 3 p orbitals, and 5 d orbitals.
7 The energy levels of electrons in the quantum mechanical model are labeled by principal quantum numbers (n). These numbers are assigned the values n = 1, 2, 3, 4, and so forth. For each principal energy level greater than 1, there are several orbitals with different shapes and at different energy levels. These energy levels within a principal energy level constitute energy sublevels.
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11 Name: Period: Date: HW 2: Electron Levels on the Periodic Table Fill in the Lewis dot structure for the periodic table. Write the Energy level, outer Sub level (Orbital) and number of electrons in that orbital with a superscript.
12 The Bohr Model of an Atoms Each possible electron orbit in Bohr s model has a fixed energy. -The fixed energies an electron can have are called energy levels. -A quantum of energy is the amount of energy required to move an electron from one energy level to another energy level.
13 The Bohr Model The rungs on this ladder are somewhat like the energy levels in Bohr s model of the atom. A person on a ladder cannot stand between the rungs. Similarly, the electrons in an atom cannot exist between energy levels. The energy levels in atoms are unequally spaced, like the rungs in this unusual ladder. The higher energy levels are closer together.
14 Quantum Atomic Model In the quantum mechanical model, the probability of finding an electron within a certain volume of space surrounding the nucleus can be represented as a fuzzy cloudlike region. The cloud is more dense where the probability of finding the electron is high. For each energy level, the Schrödinger equation also leads to a mathematical expression, called an atomic orbital.
15 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.
16 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.
17 Notes 1: Electron Configuration Summary: Find out how many electrons there are, then fill up levels and subleves until you run out of electrons Example: What is electron configuration for O 1) How many electrons are in O 8 2) What Energy levels and sub levels will be filled first (Handout) 1s 2s 2p 3) How many electrons in each sub level 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
18 Warm Up 2: Energy Levels LT I can explain how the periodic table is organized around electron energy levels and sub levels. Q1. What is an electron cloud? Q2. What do we call the different "clouds"? Q3. What are the different energy levels, can there be more than one sub level in a level? Q4. How many electrons can fit in each orbital?
19 Warm Up 2: Energy Levels LT I can explain how the periodic table is organized around electron energy levels and sub levels. Q3. What are the different energy levels, can there be more than one orbital in a level? A3. n=1, 2, 3, 4... Yes, there can be more sub levels in each energy level, s, p, d, f Q4. How many electrons can fit in each orbital? A4. 2 electrons per orbital
Warm Up 2: Energy Levels
Warm Up 2: Energy Levels 10-25-17 LT I can explain how the periodic table is organized around electron energy levels and sub levels. Q1. What is an electron cloud? Q2. What does "n" mean in reference to
Warm Up 3: Energy Sublevels LT I can write electron configuration for any atom on the Periodic Table.
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