Unit 1 Chemical Bonding: Ionic 1.3 What are ions and how do they form? AIM: How do ions form and why? DO NOW: Draw the Planetary Model of the following element. Draw a Lewis Dot Diagram of the element How many electrons does oxygen want to gain? ________ to lose?______ 2 O 6

OXYGEN GAINS 2 ELECTRONS USING DIFFERENT COLORS draw the protons, electrons and neutrons of OXYGEN. Based on your DO NOW, add the additional electrons (USE DIFFERENT COLOR) that OXYGEN wants to gain.

ANSWER THE QUESTIONS THAT FOLLOW 1.Is the # of electrons = to # protons after oxygen gains the 2 electrons? 2. Will the atom be considered NEUTRAL? (no charge) 3. How many more electrons are there compared to protons? 4. What is the charge on electrons? 5. What do you think is the charge of the atom now that there are _____ more electrons than protons?

a charged particle When atoms gain or lose e - to fulfill the OCTET RULE DEFINITION WHAT IS AN ION?

CHARGE  An ion that contains more protons than electrons will be positively charged An ion with more electrons than protons will be negatively charged. ADDITIONAL INFORMATION WHAT IS AN ION

MORE NEGATIVE ION is negatively charged RADIUS INCREASES! GAINING ELECTRONS WHAT IS AN ION

LESS NEGATIVE  MORE POSITIVE ION is positively charged RADIUS DECREASES! LOSING ELECTRONS WHAT IS AN ION

THINK MODELS

NEXT Complete the INDEPENDENT PRACTICE When you are done, you may work on the following: CHEMISTRY VOCABULARY JOURNAL - you will be allowed to use this on your quizzes and (some of) your exams