Drill o a b Determine which molecule is

Drill o a. b. Determine which molecule is polar: H and H H and Br

Objective o The student will be able to: n Identify and define different types of ions in order to name them.

SAT/HSA Enrichment … bond with hydrogen to form molecules. These molecules are attracted to each other by hydrogen bonds. a. oxygen, iodine, and nitrogen b. hydrogen, oxygen, and fluorine c. nitrogen, chlorine, and fluorine d. fluorine, oxygen, and nitrogen e. iodine, hydrogen, and chlorine

Naming Ions How are ions named?

Inquiry Activity o Element Name Search n Purpose o Students become aware of the substances in ordinary products and how they are named.

Naming Ions n A rose is rosa in Spanish, warda in Arabic, and julab in Hindi. To truly understand another culture, you must first learn the language used in that culture. Similarly, to understand chemistry, you must learn its language. For this you need to know how to name ions.

Monatomic Ions o Monatomic ions consist of a single atom with a positive or negative charge resulting from the loss or gain of one or more valence electrons, respectively.

Monatomic Ions o Cations n When the metals in Groups 1 A, 2 A, and 3 A lose electrons, they form cations with positive charges equal to their group number.

Monatomic Ions n The names of the cations of the Group 1 A, Group 2 A, and Group 3 A metals are the same as the name of the metal, followed by the word ion or cation.

Monatomic Ions o These elements have ionic charges that can be obtained from their group numbers.

Monatomic Ions o Anions n n The charge of any ion of a Group A nonmetal is determined by subtracting 8 from the group number. Anion names start with the stem of the element name and end in -ide.

Monatomic Ions o These Group A elements form anions.

Monatomic Ions

Monatomic Ions of Transition Metals n The charges of the cations of many transition metal ions must be determined from the number of electrons lost.

Monatomic Ions o These colorful solutions contain the transition metal ions Co 3+, Cr 3+, Fe 3+, Ni 2+, and Mn 2+.

Monatomic Ions o Many transition metal compounds are colored and can be used as pigments.

Monatomic Ions o Two methods are used to name the ions of transition metals. n n The Stock system The classical method

Monatomic Ions o In the Stock system, a Roman numeral in parentheses is placed after the name of the element to indicate the numerical value of the charge.

Monatomic Ions o In an older less, useful method, the classical name of the element is used to form the root name for the element.

Monatomic Ions

Polyatomic Ions o These models show the structures of four common polyatomic ions.

Polyatomic Ions o Some ions, called polyatomic ions, are composed of more than one atom. n The names of most polyatomic anions end in -ite or -ate.

Polyatomic Ions o Names and Formulas of Some Common Polyatomic Ions

Polyatomic Ions o Sodium hydrogen carbonate can relieve an upset stomach.

Polyatomic Ions o HCO 3–, HPO 42–, and H 2 PO 4– ions in your blood are critical for your health.

Polyatomic Ions o Fertilizers contain HPO 42– and H 2 PO 4– ions.

Section Quiz n 1. When metals from groups 1 A, 2 A, and 3 A form cations, the charge on the ion is equal to a. b. c. d. 8 minus the group number minus 8. the period number. the group number.

Section Quiz 2. Which of the following are positively charged polyatomic ions? n n n (I) ammonium ion (II) perchlorate ion (III) ferric ion A. I only B. II only C. III only D. I and III

Section Quiz 3. If the name of an ion ends in -ite or -ate, the ion is a A. B. C. D. polyatomic cation. polyatomic anion. transition metal cation. monatomic anion.

Class work o Section 9. 1 worksheet.

Summary Questions 1. 2. 3. 4. 5. Did we accomplish the objective? Explain. How do ions form? How are the charges of ions determined? What is the difference b/w monatomic and polyatomic ions? Design a way to remember how to determine the name of ions.

Homework o Naming Ions worksheet! o Exit ticket n Naming ions