Lesson 20: Getting Connected

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Presentation transcript:

Lesson 20: Getting Connected Ionic Compounds

ChemCatalyst Metal elements combine with the nonmetal element chlorine, Cl, to form compounds. The formulas are given in the tables. Compare the three tables. What do you notice? Predict the formula of a compound formed between lithium, Li, and chlorine, Cl. Which table would you put it in? Element Compound Na NaCl K KCl Element Compound Mg MgCl2 Ca CaCl2 Element Compound Ne none Ar

Key Question How can valence electrons be used to predict chemical formulas?

Objectives: predict the chemical formulas of compounds that will form between metal and nonmetal atoms explain how an ionic compound forms and determine whether it follows the rule of zero charge

Prepare for the Activity Work in pairs. Ionic compound: An ionic compound is a compound composed of positive and negative ions, formed when metal and nonmetal atoms combine.

Lesson 20 Notes a.)Metal and nonmetal elements combine to form ionic compounds. EX: Mg2+ + Cl– + Cl– produces MgCl2 with zero charge.

Notes (cont.) b.)The rule of zero can be used to determine the chemical formulas Rule of zero charge: In an ionic compound, the positive and negative charges add up to 0. c.) Use a SUBSCRIPT when you need more than one of any element

Notes (cont.) d.) When naming the compound: Cation = unchanged Anion = ending changed to –ide Ex: MgCl2 = magnesium chloride CaO = calcium oxide

Check-in 20 What would be the chemical formula if Strontium (Sr) formed an ionic compound with Bromine (Br)?