Data before yesterday’s group work Warm-up: Data before yesterday’s group work Grade Distribution by Bell a/o Oct. 16th A (4 pts) B (3 pts) C (2 pts) D (1 pt) E (0) b1 5 12 1 4 b2 3 11 6 2 b4 10 b5 7 1) Which bell performed best on the quiz? 2) Which bell performed worst on the quiz? 3) What % of students have a B in your bell so far? 4) What can YOU do to improve your Science grade?

T. Trimpe 2008 http://sciencespot.net/ Bonding Basics 8th Grade Science T. Trimpe 2008 http://sciencespot.net/

Ionic Covalent Metallic Types of Bonds Ionic Covalent Metallic

Warm-Up: Complete using a periodic table to help you.

ION NEGATIVE POSITIVE CATION ANION An atom that gains or loses one or more electrons is called an ____________. Atoms that gain one or more electrons will have a ____________________ charge. An atom that loses one or more electrons will have a ____________________ charge. A positive ion is called a ______________ and a negative ion is called an _______________. NEGATIVE POSITIVE CATION ANION “An-Eye-On” “Cat-Eye-On”

Ionic Bonds Atoms xfer one or more ________________ to another to form a bond. Each atom is left with a ________________ outer shell. Forms between a ___________ ion with a positive charge and a ________________ ion with a negative charge. Ex: Sodium + Chlorine ELECTRONS COMPLETE METAL NONMETAL

Example B3: Potassium + Iodine Example B4: Sodium + Oxygen Example B5: Calcium + Chlorine Example B6: Aluminum + Chlorine

Co-Valent Bonds Atoms ___________ one or more electrons with each other to bond. Each atom is left with a ________________ outer shell. Forms between two _________________atoms. Ex: 2 Hydrogen + Oxygen (water molecule) SHARE COMPLETE NONMETAL

Example C3: Chlorine + Chlorine Example C4: Oxygen + Oxygen Example C5: Carbon + 2 Oxygen Example C6: Carbon + 4 Hydrogen

Ionic Covalent Metallic Types of Bonds Ionic Covalent Metallic

Metallic Bonds Metal-to-Metal e-’s “swim” Metals: Malleable (can be hammered flat) Ductile (can be stretched) Good Conductors (electr. & heat)

LEWIS DOT Diagrams

Covalent Bond Ionic Bond

more Ionic Bonds

more Covalent Bonds