Warm-Up #27 A. 40 1.Ionic bonds form between a metal and another metal. T / F 2.A bond between two nonmetals is called a covalent bond. T / F 3.Ionic compounds.

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Presentation transcript:

Warm-Up #27 A Ionic bonds form between a metal and another metal. T / F 2.A bond between two nonmetals is called a covalent bond. T / F 3.Ionic compounds have a low melting point. T / F 4.Draw the Lewis dot structure for F. 5.Draw the Lewis dot structure for Li.

Warm-Up # 28 A. 41 Complete the chart

Warm-UP #29 Copy and Answer 1.Group 1 has two valence electrons. T / F 2.Group 13 has thirteen valence electrons. T / F 3.Group 18 has 8 valence electrons. T / F 4.What is the Lewis dot structure for Be? 5.What is the Lewis dot structure for P?

Covalent Bonding

Remember… Ionic bonds forms between metals and nonmetals. An ionic bond happens when one atom transfers its valence electron(s) to another atom.

Covalent Bonding What are covalent bonds? –A covalent bond forms when atoms share one or more pairs of valence electrons. –Covalent bonds form between a nonmetal and another nonmetal.

How to Represent Covalent Bonds Let’s consider H 2, the simplest molecule. What is the Lewis dot structure for Hydrogen? Use the Lewis dot structure to show two Hydrogen atoms combining. H hydrogen atom H hydrogen atom + H hydrogen atom

H hydrogen atom + H hydrogen atom H H hydrogen molecule Shared pair of electrons How to Represent Covalent Bonds Cont. What would the product of the two Hydrogen atoms look like? Use Lewis dot structures to show the entire reaction H H hydrogen molecule

F atom F atom + F molecule or structural formula F - F shared pair Covalent Bonding Show the reaction of two Fluorine atoms combining to create F 2.

Can atoms share more than one pair of electrons? YES!!! Atoms sometimes share more than one pair of electrons to attain 8 electrons. Double covalent bonds involve two shared pairs of electrons.

Covalent Compounds Most items around you are covalently bonded such as water, sugar, oxygen and cellulose in wood –What are some other covalently bonded things? Properties of Covalent Compounds –Brittle Solids –Low melting and boiling points

Covalent Compounds Cont. Covalent compounds frequently involve more than two atoms combining. –Water, H 2 O –Methane, CH 4