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

Section A: Complete the chart using a periodic table to help you. Element Atomic Symbol Total # of electrons # of Valance Electrons # of Electrons gained or lost Oxidation Number Chlorine   Potassium Magnesium Fluorine Aluminum Sodium Nitrogen Oxygen Carbon Iodine

# of Electrons gained or lost Section A: Complete the chart using a periodic table to help you. Check your work! Element Atomic Symbol Total # of electrons # of Valance Electrons # of Electrons gained or lost Oxidation Number Chlorine  Cl 17   7 1 gained   -1 Potassium K  19  1  1 lost +1  Magnesium  Mg  12 2   2 lost +2  Fluorine F  9  7  -1  Aluminum Al  13  3  3 lost  +3  Sodium Na 11  1 lost  Nitrogen N  5  3 gained  -3  Oxygen O  8  6  2 gained  -2  Carbon C  4  4 gained or lost  +/- 4  Iodine I  53 

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

ELECTRONS COMPLETE METAL NONMETAL What is an ionic bond? Atoms will transfer one or more ________________ to another to form the bond. Each atom is left with a ________________ outer shell. An ionic bond forms between a ___________ ion with a positive charge and a ________________ ion with a negative charge. ELECTRONS COMPLETE METAL NONMETAL

Steps for Ionic Bonding 1. draw dot diagrams 2 Steps for Ionic Bonding 1. draw dot diagrams 2. Transfer Electrons with arrows  3. (Draw more dot diagrams) 4. Write ions (atom with a charge. 5. Formula- write it out! Example B1: Sodium + Chlorine Example B2: Magnesium + Iodine

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

SHARE COMPLETE NONMETAL What is a covalent bond? Atoms ___________ one or more electrons with each other to form the bond. Each atom is left with a ________________ outer shell. A covalent bond forms between two _________________. SHARE COMPLETE NONMETAL

Steps for Covalent Bonding 1. Draw dot diagrams 2 Steps for Covalent Bonding 1. Draw dot diagrams 2. Drw Circles ( e- that are shared) 3. (Draw more dot diagrams) 4. Line Drawings 5. Formula- write it out! Example C1: Hydrogen + Hydrogen Example C2: 2 Hydrogen + Oxygen

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