8 th Grade Science T. Trimpe

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

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 Cl17 71 gained PotassiumK lost+1 Magnesium Mg lost+2 FluorineF gained AluminumAl lost +3 SodiumNa lost +1 NitrogenN gained -3 OxygenO gained -2 CarbonC gained or lost +/- 4 IodineI gained

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 _______________. POSITIVE NEGATIVE ION CATION ANION “An-Eye-On” “Cat-Eye-On”

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. Example B1: Sodium + ChlorineExample B2: Magnesium + Iodine ELECTRONS COMPLETE METAL NONMETAL

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

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 _________________. Example C1: Hydrogen + HydrogenExample C2: 2 Hydrogen + Oxygen SHARE COMPLETE NONMETAL

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