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7.2 – 7.3. Nat geo caves. http://www.youtube.com/watch?v=wgUFb_l4DLE. IONIC BONDS. Although they are composed of ions, the compounds are electrically neutral. Held together by the opposing charges of the ions, because opposites attract!. Exampley time w/ Sodium & Chlorine. Remember!!! : - PowerPoint PPT Presentation
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7.2 – 7.3
NAT GEO CAVEShttp://www.youtube.com/watch?v=wgUFb_l4DLE
IONIC BONDSAlthough they are composed of ions, the
compounds are electrically neutral.Held together by the opposing charges of the ions,
because opposites attract!
Exampley time w/ Sodium & Chlorine
Na ClIf I just had
1 less e-, I would
totally have an OCTET.
If I just had 1 MORE e-, I
would totally have an OCTET.
REMEMBER!!!:1. They are both electrically neutral:
they don’t have a positive electric charge or negative electric charge.
2. They have more electrons than the picture shows.
Lewis diagrams only show the valence electrons.
Really, Na has 11 TOTAL e- while Cl has 17 TOTAL e-.
Exampley time w/ Sodium & Chlorine
Na Cl“It would be a
shame if someone just stole this here electron while I
was looking away...”
“Don’t mind if I
do, Sodium. Yoink.”
Exampley time w/ Sodium & Chloride
Cl
(-)
Na(+) Na
(+) ClNa
(0)
Exampley time w/ Sodium Chloride
ClNa
CHARACTERISTICS OF IONIC BONDSMost are *CRYSTALLINE SOLIDS at room
temperature*(i.e. they look like crystals and are solids)
When these are molten or dissolved in water, they conduct electricity very well.
These are, unfortunately not as strong
as metallic bonds.
FORMULA UNITSWhen we have a CHEMICAL FORMULA, the
number in front of an element or compound is called a FORMULA UNIT.
These are always whole numbers that are at least 1.
EXAMPLE: NaCl CHEMICAL FORMULA
forSodium Chloride
FORMULA UNITSforEach are 1
Ca(SO4)A Calcium Ion [Ca2+] and a Sulfate Ion [SO4
2-] make the ionic crystalline solid known as GYPSUM. These are some of the largest crystals in the world.
METALLIC BONDSMetals are arranged in compact and orderly patterns.These patterns look sort of like ionic bonds, but are
different.Instead of alternating ions, there are only metal cations
surrounded by a sea of “disloyal” electrons.The electron-cation bond is what holds together metals.It allows for great electrical conductivity, ductility, and
malleability.
STRESS ON METAL & IONIC BONDSA force applied to a metal crystal can cause the
cations to move past one another quite easily. Metal has some give.
A force applied to an ionic crystal can cause the ions to repel from one another. This causes the crystal to shatter.
HOW IT’S MADEhttp://www.youtube.com/watch?v=5R6Zvp3DEh0