Oct 23 & Oct 24 QUIZ: Monoatomic Ions Starts 2 minutes after bell ring You have 7 minutes to do it.

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Presentation transcript:

Oct 23 & Oct 24 QUIZ: Monoatomic Ions Starts 2 minutes after bell ring You have 7 minutes to do it

Warm-up # 7: Atomic/Mass/Number What’s the a) atomic mass, b) mass number, c) atomic number, d) number of protons, e) neutrons, f) electrons, and g) charge of the following elements? 1) Oxygen-17; an oxide 2) Mg-26; a magnesium ion 3) An element with 10 p +, 12 n 0 and 10 e - 4) W-183; an atom 5) Element symbol for the element between platinum and mercury. What’s its atomic number? Atomic mass? Round its atomic mass to 3 digits.

Check your answers to page 5

FINISH Lab - Petri Dish Atoms Activity Complete ALL the petri dishes (only #5 should be empty) Answer the follow up questions Remember isotope notation looks like this: K Mass number of this atom Atomic number of this atom Symbol of this element Ion charge, if it is not zero +1

Follow Up Questions (you can do these at the bottoms of page 4) 1. List any atoms you found that were anions. 2. List any atoms you found that were cations. 3. List any atoms you found that were heavy isotopes. 4. List any atoms you found that were light isotopes. Isotope notation looks like this: K Heavy isotopes are 1 AMU or more than the average atomic mass. Light isotopes are 1 AMU or less than the average atomic mass Mass number of this atom Atomic number of this atom Symbol of this element Ion charge, if it is not zero +1

Petri Dishes Discussion

Isotopes vs. Ions 0 If protons vary, the identity of the element changes (this only happens in nuclear reactions!) 0 oxygen has 8 protons; fluorine has 9 protons 0 If neutrons vary, mass number changes and we have different isotopes 0 sulfur-32 has 16 neutrons; sulfur-33 has 17 neutrons 0 If electrons vary, charge changes and we have different ions 0 iron can lose two electrons to become Fe +2 ; iron can also lose three electrons to form Fe +3 0 All atoms are isotopes; isotopes can also become ions

Final Facts 0 All atoms and ions are an isotope. 0 All ions are charged. 0 All atoms are neutral. 0 They are all isotopes!

Homework 0 Sapling #1—due Friday at 11:59PM 0 Sapling #2—due Tuesday at 11:59PM 0 Quiz: Monatomic Ions on Tuesday 10/28 0 Test: Thursday 10/30