1. Aim: What are ions?
Do now: Lithium has two isotopes. One isotope of lithium has mass of amu and its abundance is 7.42%. Another isotope of lithium has mass of and its abundance is 92.58%. What is the average mass of lithium?

2. So to sum up…
Ion - charged atom. Either positively charged or negatively charged.
When you loose electrons (negative charge) the ion becomes more POSITIVE
When you gain electrons (negative charge) the ion becomes more NEGATIVE

3. Learning Check
Element
Protons
Electrons
Charge C 6 10 O 8 Li 3 2

4. QUIZ
Take everything off your desks and put under your chair. Yes even your bags.
Take out a pen or a pencil.
Put your name on the quiz, period and date
Good luck.
Home work
Worksheet to be completed over the weekend.