1. Agenda: Monday 10/25/10 Bell Work Guided Notes-Electron Configuration
Reminders:
Homework due Friday
Bell Work
Guided Notes-Electron Configuration
Electron Configuration Practice
Graph Grades
Assign homework

2. Bell Work: Monday 10/25/10
Pick up some new Bell work paper and complete.
On Page 28: Cut and glue AFTER you answer!
Describe an electron
Define configuration
Has a negative charge, very small mass,
Located in an electron cloud.
Relative arrangement of the parts of something

3. Electron configuration is the _____________________________________
Electrons are arranged in ____________ of different energy levels.
The most stable arrangement of electrons is called the ___________
___________. This means that all of the ____________ are in the
lowest energy orbitals possible.
Distribution of orbitals can be visualized with an orbital __________.
Orbitals appear in order from lowest _____________ to highest.
In our diagram, an ____________ is represented by a “_” and a label.
Electrons will be represented by arrows.
arrangement of electrons in an atom
orbitals
ground
state
electrons
diagram
energy
orbital

4. Orbital Energy Level Diagram
_ _ _ _ _ _ _ 5f
_7s
_ _ _6p
_ _ _ _ _5d
_ _ _ _ _ _ _ 4f
_6s
Level 4 has __ ______ orbital
____ ______ orbitals, ___ _____
orbitals, and ___ f orbitals s
_ _ _5p
_ _ _ _ _4d p d
_5s 7
_ _ _4p
_ _ _ _ _3d
Level 3 has _________ s orbital, _______ p
orbitals, and _______ d orbitals 1 3
_4s
_ _ _3p 5
_3s
_ _ _2p
Level 2 has higher energy. There is one _______orbital and 3 __________ orbitals s
_2s p
_1s
1 is the lowest energy level. There is one ______ orbital   s

5. III. When placing electrons into orbitals, you must follow 3 rules.
The _________ principle- Each electron occupies the lowest energy
orbital available.
The ________ exclusion principle-No more than 2 ____________
can be placed in any orbital.
Electrons have spin-either up or down. Represented as ↑ or ↓
__________ rule-Before a 2nd electron can be put into any orbital,
each of the orbitals in that energy level must contain 1 electron of the
same spin. Either all up, or all down __ __ __ 2p
aufbau
Pauli
electrons
Hund’s ↓ ↑ ↓ ↑ ↓ ↑

6. Let’s apply the rules:
a) Hydrogen
1. How many electrons does it have? _____ 1
2. What is the lowest level empty orbital? ______ (Aufbau) 1s
3. __ 1s ↓
4. We write the electron configuration: 1s1
b) Helium
1. How many electrons does it have? _____ 2
2. What is the lowest level empty orbital? ______ 1s
Can I put two electron in 1s? ______ (Pauli)
yes
4. What do we know about spin? __________________
The 2 electrons must have opposite spin.
5. __ 1s ↓↑
6. We write the electron configuration: ________
1s2

7. c) Carbon
1. How many electrons does it have? _____ 6
2. Place electrons in orbitals following the rules.
3. __ 1s __ 2s __ __ __ 2p __ 3s __ __ __ 3p __ 4s __ __ __ __ __ 3d ↑↓ ↑↓ ↑ ↑
4. We write the electron configuration: __________________
1s22s22p2
d) Nickel
1. How many electrons does it have? _____ 28
2. Place electrons in orbitals following the rules.
3. __ 1s __ 2s __ __ __ 2p __ 3s __ __ __ 3p __ 4s __ __ __ __ __ 3d ↑↓ ↑ ↓ ↓ ↑ ↓ ↑↓
↑↓ ↑↓ ↑↓ ↑↓ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↓
4. We write he electron configuration: __________________
1s22s22p63s23p64s23d8
Now you practice
Check your answers on page 917 and 918

8. Agenda: Monday 10/25/10 Attach Notes to Pages 110-111 Homework
Reminders:
Homework due Friday
Attach Notes to Pages
Homework
Two handouts &
Page
Page ,92-93
Page ,7,10
Page
Page

9. Agenda: Tuesday 10/26/10 New Seats Bell Work
Reminders:
No school tomorrow- Parents-in- touch
Homework due Friday
New Seats
Bell Work
Guided Notes-Noble Gas Notation and Valence Electrons
Practice
Homework Questions?

10. Bell Work: Tuesday 10/26/10 On Page 28:
Give the electron configurations for Neon, Argon, and Krypton.
How are these configurations the same?
Ne = 1s22s22p6
Ar = 1s22s22p63s23p6
Kr = 1s22s22p63s23p64s23d104p6
All the orbitals are completely filled. This is why these elements are so unreactive

11. Quick review of Electron Configuration
Example : Vanadium
1. Determine how many electrons _______ 23
2. Place electrons in orbitals filling lowest energy orbitals first ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↑ ↑
__ 1s __ 2s __ __ __ 2p __ 3s __ __ __ 3p __ 4s __ __ __ __ __ 3d
3. Read the electron configuration from the orbital diagram
1s22s22p63s23p64s23d3

12. Noble gas notation.
Noble gases are the 6 gases in the last column of the periodic table.
1. The electron configuration of __________ is 1s22s22p6 This can be written as ______.
Neon
[Ne]
2. Argon’s electron configuration is ___________________ or [Ar]
1s22s22p63s23p6
3. Only noble gas electron configurations are abbreviated this way.
B. Compare electron configuration of Neon and Sodium:
1. Neon = _________
1s22s22p6
2. Sodium = ______________
1s22s22p63s1
Sodium’s electron configuration contains Neon’s electron configuration. We can abbreviate the electron configuration of sodium as ___________
[Ne]3s1

13. C. Practice: Write the full electron configuration of these elements, then use noble-gas notation to write the electron configuration.
1. Magnesium (How do you know which noble gas to start with?)
1s22s22p63s2
[Ne]3s2
Chlorine
1s22s22p63s23p5
[Ne]3s23p5
3. Iron
1s22s22p63s23p64s23d6
[Ar]4s23d6
4. Antimony
1s22s22p63s23p64s23d104p65s24d105p3
[Kr]5s24d105p3

14. II. Valence Electrons
A. Valence electron’s are the electrons in the atom’s _____________ (highest energy) orbitals.
outermost
B. Valence electrons determine the ____________ properties of an element, or how it will react.
chemical
C. Example: Potassium has ____ electrons. Its electron configuration is _________________, or __________ (noble-gas notation). The highest energy level electron is the _____ electron. This is the only valence electron. 19
1s22s22p63s23p64s1
[Ar] 4s1
4s1
D. Example: Carbon has ____ electrons. Its electron configuration is ______________, or _________ (noble-gas notation). The highest energy level electrons are the level 2 electrons. Carbon has ____ valence electrons. 6
1s22s22p2
[He]2s22p2 4

15. Agenda: Thursday10/28/10 Bell Work
Reminders:
Homework due Friday
Bell Work
Continuation/finishing Guided Notes- Electron Configuration
Electron Configuration Practice
Homework Questions?

16. Bell Work: Thursday 10/28/10 On Page 29:
Write the Isotopic symbol for Lithium-6, list how many protons, electrons and neutrons it has, write the electron configuration; and list the number of valence electrons.
p=3, e=3 n=3
1s2s21
Valence e=1

17. 1s22s1 Energy levels are the numbers The orbitals are the letters
Electrons are the superscript
1s22s1

18. III. Electron-dot structures
A. Shorthand method to visually represent _____________ electrons
valence
B. Consists of the element’s ___________ surrounded by dots representing the valence electrons.
symbol
C. Dots representing valence electrons are placed one at a time on the four sides of the symbol and then paired up until all are used.
Example: Nitrogen-electron configuration is [He]2s22p3 Nitrogen has ___ valence electrons. We write the electron dot structure as ________ 5
STOP

19. Electron Configuration Electron-dot structure
Element
Number of electrons
Electron Configuration
Valence electrons
Electron-dot structure
Lithium 3
[He]2s1 1
Beryllium 4
[He]2s2 2
Boron 5
[He]2s22p1
Carbon 6
[He]2s22p2
Nitrogen 7
[He]2s22p3
Oxygen 8
[He]2s22p4
Fluorine 9
[He]2s22p5
Neon 10
[He]2s22p6

20. Agenda: Thursday10/28/10 Attach notes to p112-113 Homework Questions?
Reminders:
Homework due Friday
Test Postponed to Monday
Attach notes to p
Continuation/finishing Guided Notes- Electron Configuration
Homework Questions?
Bonus Signatures due tomorrow

21. Agenda: Friday10/29/10
Reminders:
Homework due Today
Test on Monday!
Get out your homework, I will be spot checking during bell work
Bell Work
Continuation/finishing Guided Notes- Electron Configuration
Homework Questions?
Electron Configuration Practice 21

22. BELL WORK: Friday 10/29/10 On Page 29:
For 40K+, list how many protons, electrons and neutrons it has, write the electron configuration; and list the number of valence electrons. What is special about this chemical?
p=19, e=18 n=21
1s22s22p63s23p6
Valence e=8
It has lost an electron 22

23. Agenda: Friday10/29/10
Reminders:
Homework due Today
Test on Monday!
Continuation/finishing Guided Notes- Electron Configuration
Homework Questions?
Electron Configuration Practice
Test MONDAY! 23

24. Practice problems

25. Choose at least one of the statements below, and write a practice problem (with answer) that illustrates the statement. Let me know which statement you are illustrating. Do not use any of the problems we have used in class.
No atomic orbital can contain more than two electrons.
Electrons in the same atom with the same spin must be in different orbitals.
Electrons in the same orbital of the same atom must have different spins.