10/27 What happens during ionic bonding?
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Transcript of 10/27 What happens during ionic bonding?
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
Cats make me happy!
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!