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7.2 – 7.3

7.2 – 7.3

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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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Page 1: 7.2 – 7.3

7.2 – 7.3

Page 2: 7.2 – 7.3

NAT GEO CAVEShttp://www.youtube.com/watch?v=wgUFb_l4DLE

Page 3: 7.2 – 7.3

IONIC BONDSAlthough they are composed of ions, the

compounds are electrically neutral.Held together by the opposing charges of the ions,

because opposites attract!

Page 4: 7.2 – 7.3

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-.

Page 5: 7.2 – 7.3

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.”

Page 6: 7.2 – 7.3

Exampley time w/ Sodium & Chloride

Cl

(-)

Na(+) Na

(+) ClNa

(0)

Page 7: 7.2 – 7.3

Exampley time w/ Sodium Chloride

ClNa

Page 8: 7.2 – 7.3

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.

Page 9: 7.2 – 7.3

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

Page 10: 7.2 – 7.3

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.

Page 11: 7.2 – 7.3

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.

Page 12: 7.2 – 7.3

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.

Page 13: 7.2 – 7.3

HOW IT’S MADEhttp://www.youtube.com/watch?v=5R6Zvp3DEh0