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Lesson 3.05

Lesson 3.05. Ionic Bonding and Writing Formulas. 3.05 Ionic Bonding and Writing Formulas. http:// bit.ly/YZkOWc. Watch the following video about ions: Then, draw a line from each word to its correct definition. Ion Monoatomic Ion Polyatomic Ion Anion Cation

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Lesson 3.05

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  1. Lesson 3.05 Ionic Bonding and Writing Formulas

  2. 3.05 Ionic Bonding and Writing Formulas http://bit.ly/YZkOWc Watch the following video about ions: Then, draw a line from each word to its correct definition. Ion Monoatomic Ion Polyatomic Ion Anion Cation • An atom or a group of atoms that form a charge by gaining or losing one or more electrons. • An ion that has a positive charge • Two or more atoms bonded together. Can have an overall charge of positive or negative. • An ion that has a negative charge • An ion consisting of one element

  3. Practice Determining Charge http://bit.ly/YZkOWc Watch the video about common charges: Download a periodic table with common charges here: What is the common charge for: a. Calcium: _____ b. Phosphorus: ____ c. Hydrogen: ____ d. Sulfur: _____ e. Aluminum: ____ f. Iodine: ______ http://bit.ly/XrbE70

  4. Let’s Write That Formula

  5. Ionic Compounds - Vocabulary • Ionic Bonding – A chemical bond that is due to transfer of electrons between a cation (metal or H) and an anion (nonmetal). • Ionic Compounds - A compound composed of positive and negative ions that are combined in a ratio where the positive and negative charges cancel out. Overall net charge is zero. The cation is always written first. • Formula Unit - The formula of an ionic compound that represents the simplest whole number ratio of ions in the compound.

  6. Writing Formula Units (Formulas) – The Basics Example:Write the formula when calcium and phosphorus bond. • Write each ion • The positive ion is always written first, then the negative ion. • Determine how many of each ion we need to make the compound neutral. That will be their subscripts. • Subscripts must be the lowest whole number ratio. • Check your work • Make sure that the net charge of the formula is zero.

  7. Writing Formula Units Practice • Aluminum and Phosphorus • Calcium and Lithium • Bromine and Barium • Nitrogen and Fluorine

  8. Writing Formula Units – Criss-Cross & Reduce Method Write the formula that forms when the following pairs of elements form an ionic bond: Potassium and Nitrogen Hydrogen and oxygen 3. Magnesium and sulfur 4. Strontium and selenium

  9. 3.05 Comprehension Check • What is the common charge of a magnesium ion? • What is the formula that results when chlorine bonds with barium? • Identify three atoms that would lose two electrons to empty its valence energy level. • What subscripts are needed to complete the formula unit Al_N_? • Which of the following forms a cation? • Br b. Li C. N • Which of the following is a possible formula unit? • KN3 b. I3N c. MgO

  10. Thank You! • It has been great working with you for Writing Ionic Compounds! You will use this for the rest of module 3, module 4 and most of segment 2. • Please use our other recorded teaching sessions for the other lessons. Don’t forget that you can use them to review previous lessons too!

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