Practice Drawing Lewis Dot Structuresat the top margin of page 4
H
Na
Cl
What does the number of dots around the atomic symbol represent??The number of valence electrons
The Rule of
8
Atoms tend to gain, lose, or share electrons until
they have eight valence electrons.
Lewis Dot Structure Structural Formula
Cl
Covalent bonds are formed between non-metals and non-metals
ClH
HChlorine and Hydrogen will
share their electrons
Note: Hydrogen is content with 2 electrons, not 8.
H-Cl
Lewis Dot Structure Structural Formula
Bonding Pair- pairs of shared electrons within the molecule
Lone Pair- a pair of electrons in the valence shell of an atom that does not participate in bonding Single bonds occur when a single pair of
electrons are shared between atoms
NH H
HN HHH
Ex: NH3
Ammonia
N HHH
H2 H H H H H-H
Cl2Cl Cl
Cl ClCl-Cl
Hydrogen Gas
Chlorine Gas
Double Bonds occur when atoms share two pairs of electrons
O O O O
Ex: O2
Oxygen gas
O=O
Triple Bonds form when atoms share three pairs
of electrons
Ex: N2
Nitrogen gas
N NN N
N N
O=C=O
H-O-H
Carbon dioxide
Water
O OC
Bellwork: Monday 3/26/2012Count the atoms of each element in the
following: Na2SO4
(2) Sodium, (1) Sulfur, (4) Oxygen 2Al2(CO3)2
(4) Aluminum, (4) Carbon, (12) Oxygen
Draw the Lewis Dot Structure and Structural Formula for Chlorine gas (Cl2)
Monday 3/26/2012 Finish hanging any projects that are left!
Nothing can be on the back two tables because we need them for our periodic table made out of tissue boxes!
Presentation Element Name / Molecule NameAtomic Symbol / Molecular formulaAtomic Number / Total Molecular weight2 Interesting Facts
○ Origin of name? Uses? Cool things or facts? Etc.
○ NOT malleable, luster, number of orbitals, etc.
Presentation Order P1 Allison Juliet Joey Nicole Kassandra Andrew Jristin Austin Tim Fred Michael Sierra Natalie Lyndsie
Joseph Destiny Brianna Caity Sam Jade Donovan Jordan Katrina Cassidy Brenden Quinn Cecelia
If you don’t have your 3D
model, you don’t present!
Presentation and model will be LATE!
Presentation: • Element Name /
Molecule Name• Atomic Symbol /
Molecular formula• Atomic Number / Total
Molecular weight• 2 Interesting Facts
• Origin of name? Uses? Cool things or facts? Etc.
• NOT malleable, luster, number of orbitals, etc.
Presentation Order P2 Angelo Gary Sabrina Ronnie Bryan H. Leslie Megan Michael Vizzi Brian C. Angie Bianca Ty Scarlett Logan
Robbie Richard Marukh Chris Rachael Kyle Sean Vanessa Austin Wesley Trey Savanna Jordan Mike Verrochi
If you don’t have your 3D
model, you don’t present!
Presentation and model will be LATE!
Presentation: • Element Name /
Molecule Name• Atomic Symbol /
Molecular formula• Atomic Number / Total
Molecular weight• 2 Interesting Facts
• Origin of name? Uses? Cool things or facts? Etc.
• NOT malleable, luster, number of orbitals, etc.
Presentation Order P3 Mary Ann Isaiah Andrew Kolton Dylan M. Brooke Priscilla Kristina Brooklyn Allison Austin McKenzie Fermin Adela Joey
Michael R. Dawson Angelica Jasmine Jordan H. Sam Dylan P. Michael C. Joseph Lindy Adam Tiffany Isabel Jordan W. Jon Jon Charlie
If you don’t have your 3D
model, you don’t present!
Presentation and model will be LATE!
Presentation: • Element Name /
Molecule Name• Atomic Symbol /
Molecular formula• Atomic Number / Total
Molecular weight• 2 Interesting Facts
• Origin of name? Uses? Cool things or facts? Etc.
• NOT malleable, luster, number of orbitals, etc.
Presentation Order P5 Ean Elizabeth Michael Derek Riley Matt Josh Taylor Brody Gloria Maddie Alyssa Steven Maxine Kellie Liya John Rachel
Hayden Trev Mason Andrew Nikki Brian Carolina Vanessa Kahlil Issac Edrian Sierra Allie Wendy Justin Cerys Gracyn Cameron
If you don’t have your 3D
model, you don’t present!
Presentation and model will be LATE!
Presentation: • Element Name /
Molecule Name• Atomic Symbol /
Molecular formula• Atomic Number / Total
Molecular weight• 2 Interesting Facts
• Origin of name? Uses? Cool things or facts? Etc.
• NOT malleable, luster, number of orbitals, etc.
Presentation Order P6 Abby Riley H. Sarah Paloma Francis Edward Graham Celia Dani Cassidy Mackenzie Carlson Jake
Linh Aspen Steven Riley C. Alex Kylee Christina Paige Alissa Nate Haley Nidia James
If you don’t have your 3D
model, you don’t present!
Presentation and model will be LATE!
Presentation: • Element Name /
Molecule Name• Atomic Symbol /
Molecular formula• Atomic Number / Total
Molecular weight• 2 Interesting Facts
• Origin of name? Uses? Cool things or facts? Etc.
• NOT malleable, luster, number of orbitals, etc.
Practice Drawing Covalent Bonds Using the
transparent cards on the table, show how the electrons can be shared in the following covalent bonds:I2Cl2CO2
H2O
O2
N2
Remember: the electrons MUST be between the symbols. You also can only have 2 on each side…So you may need to turn and twist the pictures until it looks the way it should!
NO Bell Work: Tuesday 3/27/2012 Interims today! All you need is a
pencil and a scantron. Good luck! When you are done, you may read a science magazine, read a book, or work on homework for other classes.
Don’t forget! Your tissue box is DUE THURSDAY!!
Period 2 – Once you finish, if you have not presented, come up to me so you can present
Bellwork: Wednesday 3/28/2012Draw the Lewis
Structure and Structural Formula for:
1. CH4
2. NF3
3. HI
HH H
HC
CH
H HH
FF FN N
FF F
HI I H
What is in a name? A chemical formula tells
what elements are in a compound, and the exact number of atoms of each element needed. Ex: NH3, H2O
Covalent bonds and Ionic bonds are named in different ways, but both show the elements and numbers of atoms in their own ways
Name this compound:
Ba(Na)2 Answer:
Banana!
The first atom listed… Is capitalized Is written as the name of that elementIncludes a prefix if there are more than one of that atom
The second element…Is written in lowercaseMay include a prefix to tell how many atoms there areIs shortenedEnds in the suffix “-ide”
Ex: CO2
…is Carbon dioxide
chlorine
sulfurnitrogenfluorine
chloridesulfidenitridefluoride
When shortening a name:Eliminate the second syllable at the first vowelExchange this for the suffix “-ide”
bromine
oxygen
hydrogen
iodine
bromide
oxide
hydride
iodide
Br
O
H
I
Number Prefix Example Name
1- 1st None used n/a n/a
1- 2nd O
2 O2
3 H3
4 Cl45 O5
6 Cl67 S7
8 Br8
9 H9
10 C10
penta-
di-
tri-
tetra-
deca-
hexa-
hepta-
octa-
nona-
mono- (use only for Oxygen)
monoxide
dioxide
trihydride
tetrachloride
pentoxide
hexachloride
heptasulfide
octabromide
nonahydride
decacarbide
p oxide
P2O5
Diphosphorous• Is capitalized • Is written as the name of that
element•Includes a prefix if there are more than one of that atom
• Written in lowercase• With a prefix to tell how
many atoms there are• Shortened, and ends in the
suffix “-ide”
ent
Naming Diatomic Covalent Molecules
O2
Oxygen gas F2
Fluorine gas Br2
Bromine gas
I2Iodine gas
N2
Nitrogen gas Cl2
Chlorine gas
Even though the following gases travel in pairs (diatomic)…their names are
simple…
Naming Covalent Bonds Practice Problems: CO
Carbon monoxide
CO2 Carbon dioxide
PBr3
Phosphorous tribromide
CCl4Carbon
tetrachloride
XeF3
Xenon trifluoride AsI3
Arsenic triodide IF5
Iodine pentafluoride
N2S5
Dinitrogen pentasulfide
Example #1-Names to Formulas
Sulfur trioxide
S O1 32. Write number of atoms
1. Write symbols of elements
Final FormulaIf no prefix, then 1 is implied
and not written
Example #2-Names to Formulas
Dichlorine heptaoxide
Cl O2 72. Write number of atoms
1. Write symbols of elements
Final Formula
Example #3-Names to Formulas
Oxygen difluoride
O F1 22. Write number of atoms
1. Write symbols of elements
Final FormulaIf no prefix, then 1 is
implied and not written
Example #4-Names to Formulas
Dinitrogen tetraoxide
N O2 42. Write number of atoms
1. Write symbols of elements
Final Formula
Example #5-Names to Formulas
Phosphorus pentachloride
PCl1 52. Write number of atoms
1. Write symbols of elements
Final FormulaIf no prefix, then 1 is implied
and not written
Example #6-Names to Formulas
Dinitrogen monoxide
N O2 12. Write number of atoms
1. Write symbols of elements
Final FormulaIf no prefix, then 1 is implied
and not written
Example #7-Names to Formulas
Carbon monoxide
C O1 12. Write number of atoms
1. Write symbols of elements
Final FormulaIf no prefix, then 1 is implied
and not written
Example #8-Names to Formulas
Sulfur hexafluoride
S F1 62. Write number of atoms
1. Write symbols of elements
Final FormulaIf no prefix, then 1 is implied
and not written