# Bell Ringer (on quarter sheet!) Please have the

Bell Ringer (on quarter sheet!) Please have the following out on your desk: - Labeled Periodic Table from yesterday - WS from yesterday (electron configuration)

-Periodic Table Where are the following??

Alkaline Earth metal Element with 3 valence eElement that needs 2 eTotal of 8 valence eWill form a +1 ion Halogens When completed, turn in to the box

New Terminology The Atom Energy Levels Berkner

Hallways Sublevels Classrooms on each hall Orbitals Desks Electrons

You orbitals hold 2 e-P orbitals hold 6 eSpherical Dumb bell orbitals hold 10 e- F orbitals hold 14 eEliptical We will learn three ways to

show electron configuration 1. 2. 3. Electron Configuration Notation Orbital Notation Lewis Dot Notation (1st 3 periods) 1. Electron Configuration

Look at the electron configuration for Chromium: 1s2 2s2 2p6 3s2 3p6 4s2 3d4 Highlight the energy levels in yellow Underline the sublevels in red

Circle the electrons in green Look at the electron configuration for Chromium: 1s2 2s2 2p6 3s2 3p6 4s2 3d4 What does 3d4 mean? 4 electrons in d shaped orbital

3 energy levels away from the nucleus How many valence electrons does chromium have? 2 electrons in outermost energy levels (4th energy level) Electron Configuration Notation Write coefficient for energy level.

Write letter for sublevel Superscript (number on top) shows # of electrons at that level. Na C 1s22s22p63s1 It can also 1s22s22p2 be

expressedNobel Gas like this. Notation [Ne] 1 3s [He] 2s2 2p2 The Order Electrons Fill Orbitals

Electron Configuration of Zr 1s2 2s2 2p63s2 3p6 4s2 3d10 4p6 5s2 4d2 Practice Write the long hand configuration for the following elements. Shorthand Notation

How do I write less? Na was 1s22s22p63s1 In shorthand, find the previous noble gas (one row up) Neon, put it in brackets, then continue with the next orbital (period#,s) [Ne] replaces the 1s22s22p6 [Ne]3s1 C was 1s22s22p2 shortcut is [He]2s22p2 Core Notation of Sn

Locate Sn on the periodic table Shorthand Electron Configuration of Sn Sn [Kr] The noble gas core is Kr Sn [Kr]5s2

The noble gas core is Kr From Kr, go 2 spaces across the s-block in the 5th row 5s2 Sn [Kr]5s24d105p2

The noble gas core is Kr From Kr, go 2 spaces across the s-block in the 5th row 5s2 Then go 10 spaces across the d-block on the 5th row 4d10 Finally go 2 spaces into the p-block on the 5th row 5p2 2. Orbital Notation Tells in more detail where the electrons are: 1. What energy level they are on 2. What sublevel they are on 3. What axis they are on (x,y,z)

4. What spin they have (clockwise/counterclockwise) Aufbau Principle Each electron occupies the lowest energy orbital available.

The orbital diagram is Page 135 The d orbitals fill up in levels 1 less than the period number, so the first d is 3d

even though its in row 4. S1 S2 p1 p2 p3 p4 p5 p6 1 2 3 4 4d 5d

5 6 7 3 d Aufbau Diagram if you want

to use this, memorize how to draw it S levels hold 2 e P levels hold 6 e D levels hold 10 e F levels hold 14 e Look at the periodic table, and the blocks, how can you easily remember these numbers?

Hunds Rule If you have more than one orbital in a sublevel (p,d,f), place one electron in each orbital before you double up. Pauli Exclusion Principle Electrons

Maximum have opposite spin directions of two electrons may occupy a single atomic orbital Orbital Notation Na ___

1s ___ 2s ___ ___ ___ 2p 2p 2p ___ 3s

Letters/numbers represent energy level (remember start at bottom of chart) ___ lines represent 1 orbital each. Practice Show Cl As

orbital notation for Cl and As Practice Orbital Diagram! Refer to a periodic table and write the electron configurations of these atoms. Write the orbital diagram for the orbitals not in the noble gas core. Zn I

Lewis Dot Structures Lewis Dot Notation Lewis Dot diagrams show electrons available for bonding (the outermost electrons, valence) Valence

electrons = the total electrons in the last principal quantum level (highest coefficient) Reminders Electron Configuration WS (picked up yesterday) will be due on Friday, 9/26 Skills check on electron configuration on

Friday, 9/26 e- configuration Battleship tomorrow! Exit Ticket Write the electron configuration for Oxygen

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