Launch: 10/27   Grab your binder and immediately take a seat

  Place homework (practice questions) on desk

1.  Label the following compounds as either ionic, covalent, or metallic

i. LiF iii. Co v. CO vii. Cl2 ix.HI

ii. NH3 iv. MgBr2 vi. LiOH viii. NaCO3 x.AgNO3

What happens during ionic bonding?

Mr. Heffner 10/27/09

What is an ionic bond?   Ionic bonds are…

  formed between a metal and a nonmetal when electrons are exchanged.

What happens during ionic bonding?

  Video summary 1.  Valence electrons collide 2.  Electron is exchanged

3.  Two ions are formed 4.  Opposites attract!

1.  The valence electrons collide

What happens during ionic bonding?

1.  The valence electrons collide

What happens during ionic bonding?

What happens during ionic bonding?

2.  A valence electron is exchanged

1 valence e- 7 valence e-

Octet Rule = everyone wants 8!

What happens during ionic bonding?

3.  Two ions are formed   Cation: positively (+) charged atom, lost an electron

  Always the metal

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Positively charged

8 valence e-

What happens during ionic bonding?

3.  Two ions are formed   Anion: negatively (-) charged atom, gained an electron

  Always the nonmetal

Negatively charged

8 valence e-

anion = a negative ion

What happens during ionic bonding?

4.  Opposites attract!   Electrostatic attraction holds the two atoms together

Summary

1.  Valence electrons collide

2.  Electron is exchanged

3.  Two ions are formed

4.  Opposites attract!

Practice Questions 1.  What is an ionic bond?

2.  What is a cation?

3.  List three ways anions are different from cations.

4.  In an ionic bond, what type of ion is the metal?

5.  In 1-2 sentences explain why atoms stick together in an ionic bond.

Ionic Bonds Storybook   Make the book

  Make a title page – your name, block, and date

  Fill in the pages with the 4 steps of ionic bonding   Write the step across the top

  On the left page, draw a picture   On the right page, write the story

  Be sure to include the following terms: •  ionic

•  valence

•  exchanged

•  cation

•  anion

•  electrostatic

Exit Slip 1.  Unlike in covalent compounds, atoms in ionic

compounds a.  share valence electrons to obtain a stable octet. b.  are always a nonmetal and a nonmetal. c.  exchange valence electrons and form ions.

d.  are always two metals

Exit Slip 2.  What are anions?

a.  positively charged atoms b.  negatively charged atoms

c.  atoms with more protons than electrons d.  atoms that have gained a proton

Exit Slip

3.  The picture above is an example of a a.  cation b.  anion

c.  isotope d.  nonmetal

Exit Slip 4.  Why are cations in an ionic bond positively

charged? a.  because the metal loses an electron and becomes

positively charged. b.  because the nonmetal gains an electron and

becomes positively charged. c.  because metals have a higher electronegativity than

nonmetals. d.  because the electrostatic repulsion between the two

atoms pushes them apart.

Exit Slip 5.  What holds atoms together in an ionic bond?

a.  shared pairs of electrons between the atoms b.  exchanged electrons result in two positively charged

ions form a bond c.  the sea of electrons acts like a glue to keep the

nuclei together

d.  electrostatic attraction between anions and cations

Homework   Finish storybook

  Study your flashcard!