1. Unit 2: Chemical Interactions Chapter 5: Atoms & Bonding
Big Idea: Atoms of different elements combine to form compounds by gaining, losing, or sharing electrons

2. 4 Sections Atoms, Bonding, & the Periodic Table Ionic Bonds
Covalent Bonds
Bonding in Metals
Mrs. Lee - Ch 5

3. Sec 1: Atoms, Bonding, & the Periodic Table
KEY CONCEPTS
The number of valence electrons in an atom of an element determines many properties of that element, including the ways in which the atom can bond with other atoms
The periodic table reveals the underlying atomic structure of atoms, including the arrangement of the electrons
Mrs. Lee - Ch 5

4. Sec 1: Key Terms Valence electron Electron dot diagram Chemical bond
Mrs. Lee - Ch 5

5. Sec 2: Scientific Inquiry
KEY CONCEPTS
Ionic bonds form as a result of the attraction between positive & negative ions
When ionic compounds form, the charges on the ions balance out
Mrs. Lee - Ch 5

6. Sec 2: Ionic Bonds (cont’d)
For an ionic compound, the name of the positive ion comes first, followed by the name of the negative ion
In general, ionic compounds are hard, brittle crystals that have high melting points & conduct electricity when dissolved in water
Mrs. Lee - Ch 5

7. Sec 2: Key Terms Ion Polyatomic ion Ionic bond Ionic compound
Chemical formula
Subscript
Crystal
Mrs. Lee - Ch 5

8. Sec 3: Covalent Bonds KEY CONCEPTS
The force that holds atoms together in a covalent bond is the attraction of each atom’s nucleus for the shared pair of electrons
Molecular compounds have low melting & boiling points & do not conduct electric current
Unequal sharing of electrons causes bonded atoms to have slight electrical charges
Mrs. Lee - Ch 5

9. Sec 3: Key Terms Covalent bond Molecule Double bond Triple bond
Molecular compound
Polar bond
Nonpolar bond
Mrs. Lee - Ch 5

10. Sec 4: Bonding in Metals KEY CONCEPTS
Alloys are generally stronger & less reactive than the pure metals from which they are made
Metal atoms combine in regular patterns in which the valence electrons are free to move from atom to atom
Mrs. Lee - Ch 5

11. Sec 4: Bonding in Metals (cont’d)
The “sea of electrons” model of metallic bonding helps explain the malleability, ductility, luster, high electrical conductivity, & high thermal conductivity of metals
Mrs. Lee - Ch 5

12. Sec 4: Key Terms
Alloy
Metallic bond
Mrs. Lee - Ch 5