Unit 5: Ionic Bonding & Nomenclature. Section 1: Ions Pyrite (FeS 2 ) is a common mineral that is often mistaken for gold—hence its nickname, “fool’s.

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Presentation transcript:

Unit 5: Ionic Bonding & Nomenclature

Section 1: Ions Pyrite (FeS 2 ) is a common mineral that is often mistaken for gold—hence its nickname, “fool’s gold.” Pyrite is an example of a crystalline solid. In this chapter, you will learn about crystalline solids composed of ions that are bonded together. But first you need to understand how ions form from neutral atoms.

Valence Electrons: electrons in the highest occupied energy level - determines chemical properties - only e - involved in chemical reactions 9-Fluorine (F)11-Sodium (Na)10-Neon (Ne) Group # = Valence #

Electron dot structures: diagrams showing valence e - as dots

Electron dot structures: diagrams showing valence e - as dots

Electron dot structures: diagrams showing valence e - as dots

Electron dot structures: diagrams showing valence e - as dots

Electron dot structures: diagrams showing valence e - as dots

Electron dot structures: diagrams showing valence e - as dots

Electron dot structures: diagrams showing valence e - as dots

Electron dot structures: diagrams showing valence e - as dots

Electron dot structures: diagrams showing valence e - as dots

The Octet Rule most atoms form bonds to have 8 valence e - full outer energy level like the Noble Gases Ne Lewis dot structure

nonmetals gain electrons to form negative ions to achieve a complete octet in its valence level. Anions metals lose electrons to form positive ions leaving a complete octet in the next-lowest energy level. Cations

The electron configuration of the sodium ion is the same as that of a neon atom.

Group 1 always 1 + charge 7.1 MgNa Mg 2+ Na + Group 2 always 2 + charge

Ionic Compounds Charges of Ions

Formation of Anions 7.1 The electron configuration of the chloride ion is the same as that of argon.

Formation of Anions Oxygen is in Group 6A. 7.1

Group 16 (6A) always 2 - charge Group 15 (5A) always 3 - charge Group 17 (7A) always 1 - charge FFO O N N

7.1 Anions names typically end in -ide

charges vary but always + Charges of Ions

Conceptual Problem Fill in the blanks. 1.Iodine gains __ e - to form ___ 2.Magnesium loses __ e- to form ___ 3.Sulfur _____ __ e - to form ___ 4.Aluminum _____ __ e - to form ___ 1 I-I- 2 Mg 2+ gains 2S 2- loses3Al 3+

Quick Quiz! 1. How many valence electrons are in an atom of oxygen? A.2 B.4 C.6 D.8

Quick Quiz. 2. Atoms that tend to gain a noble gas electron configuration by losing valence electrons are A.metals. B.nonmetals. C.halogens. D.anions.

3. When a magnesium atom forms a cation, it does so by A.losing two electrons. B.gaining two electrons. C.losing one electron. D.gaining one electron. Quick Quiz.

4. When a bromine atom forms an anion, it does so by A.losing two electrons. B.gaining two electrons. C.losing one electron. D.gaining one electron

Quick Quiz. 5. Write the name and the symbol of the ion formed from a nitrogen atom. A.nitrogen ion, N 3+ B.nitride, N - C.nitride, N 3- D.nitrogen ion, N 2-