Molecular covalent

Network covalent

Ionic

Metallic

4 types of crystalline solids

Let’s look at the table!

Type Structure Hardness Melting/ boiling point

Conductivity

Molecular covalent

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Network covalent

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Ionic Click Click Click Click

Metallic Click Click Click Click

FIND AN EXAMPLE OF EACH ON YOUR OWN!!

Crystal lattice structure: alternating cations and anions held together by electrostatic attractions (+ attracted to -, just like a magnet!)

Ionic: Structure Back to table

Ionic compounds are hard!! Make sure in your table, you also know what it means

that an ionic compound is brittle and why!

http://auden.webster.edu/~scottsus/characteristics.htm

Ionic compounds: Hardness

Back to table

http://www.kentchemistry.com/links/bonding/ionicProps.htm

Ionic: MP/BP Back to table

Read the caption for the three pictures in the link below.

http://www.chem.ufl.edu/~itl/2051_s97/week_1/ionic.html

Ionic: Conductivity Back to table

http://sixthsense.osfc.ac.uk/chemistry/bonding/metallic.asp

Metallic structure Back to table

Scroll down to “Strength and workability” and write information about hardness,

malleability, and ductility

http://www.chemguide.co.uk/atoms/structures/metals.html#top

Metallic: Hardness Back to table

Scroll to slide 8!!

http://www.slideshare.net/chemistryhelpline/properties-of-compounds-ionic-covalent-and-metallic

Metallic: ConductivityBack to table

Scroll to slide 8!!

http://www.slideshare.net/chemistryhelpline/properties-of-compounds-ionic-covalent-and-metallic

Metallic: MP/BP Back to table

http://www.avogadro.co.uk/structure/chemstruc/network/g-molecular.htm

Click on the link, and press “covalently bond C atoms” and “keep bonding” to see the

structure.

Covalent Network: Structure

Back to table

http://www.avogadro.co.uk/structure/chemstruc/network/g-molecular.htm

Read the first paragraph!

Covalent network: MP/BP

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Scroll to slide 4!!

http://www.mi.mun.ca/users/pfisher/Chemistry1011_92.pdf

Network covalent: Conductivity

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Since there is a network of strong covalent bonding, network covalent solids are very

hard.

Network covalent: hardness

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Molecular covalent are all nonmetal atoms. You drew examples of these when we did lewis structures. The molecules are held

together by intermolecular forces. Here is an example:

Molecular Covalent: Structure

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Since molecular covalent molecules are held together by IMFs which are MUCH weaker

than bonds, molecular covalents are considered soft molecules.

Molecular covalent: Hardness

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Scroll a ways down to “electrical conductivity”

http://www.chemguide.co.uk/atoms/structures/molecular.html

Molecular covalent: conductivity

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2nd paragraph!!

http://www.chemguide.co.uk/atoms/structures/molecular.html

Molecular covalent: MP/BP

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