# The Periodic Table and Periodic Law

The Formation and Nature of Ionic Bonds Objectives: AHSGE Reading 4.3 Discern organizational patterns. 3.1 Utilizing electron configurations, Lewis dot structures, and orbital notations to write chemical formulas 6.2 Assigning oxidation numbers for individual atoms of monatomic and polyatomic ions Formation of an Ionic Bond

Define ionic bond. Answer: the electrostatic force that holds oppositely charged particles together in an ionic compound Binary ionic compounds contain ____ different elements. MgO? CaSO4? In ionic compounds, one part must gain electrons, and one part must lose electrons. WHY?????

Example: Ca + F 1. Which element will GAIN electrons to form an ion? 2. How many will it gain? 3. Write the formula for the ion formation? 4. What is the name of the ion? 5. How many will the other element lose when it forms an ion? 6. Write the formula for the ion formation. 7. What is the name of the ion? Example: Ca + F (continued)

We determined that calcium loses 2 electrons, and fluorine gains 1. If a fluoride ion can only take 1 of calciums electrons, what will calcium do with the other electron it loses? Answer: It will look for another ion to take it. So how many fluoride ions does each calcium ion want to bond with? Answer: 2 Example: Ca + F (continued)

Mathematically : 1 Ca ion (+2) + 2 F ion (-1) = 1(+2) + 2(-1) = 0 Ca ion F ion Find the least common multiple of the 2 oxidation numbers in this case, 2. The charges must balance so the whole compound is neutral (total charge = 0)! The formula will have 1 Ca and 2 F ions, so

it will be CaF2. Example: Ca + F (continued) The formula obtained is called the formula unit: the simplest ratio of the ions in an ionic compound. Its name will be metal + nonmetal-ide, or calcium fluoride. Formation of an Ionic Bond 3 ways to show the formation of an ionic compound:

1. Electron configuration 2. Orbital notation 3. Electron-dot structure Look at the opening review for this chapter!!! 1. [Ne] 3s1 + [Ne] 3s23p5 [Ne] + [Ar] + nrg What happens to the [Ne] 3s1? What happens to the [Ne] 3s23p5? Why is there energy released? Formation of an Ionic Bond

2. Orbital notation Write the orbital notations for both Na and Cl. What do you think will happen to the extra electron in the 3s orbital of Na? What will the new orbital notations look like? 3. Electron-dot structure Write the electron-dot structures for both Na and Cl. Write the electron-dot structures of the ions formed.

Practice Problems Assignment Use the example from your notes (also found on p.216) and Example Problem on p.217 to complete Practice Problems 7-11, p.217. You may use whichever method works best for you!!! Complete #7 and let me check your work BEFORE YOU CONTINUE!

Nature of Ionic Bonds Liquid forms are electrolytes: conduct an electrical current. (Why arent solids?) Formation of ionic bonds is exothermic: ? because the ionic compound formed is more stable and lower in energy than the individual ions Hard, rigid, brittle solids with high melting points and boiling points because it requires a lot of energy to break those strong ionic bonds.

Electronegativity difference is > 1.6 Workbook Assignment Pp. 44-45: OMIT 7-9, 19-23

## Recently Viewed Presentations

• Menerka isi dompet Selesai Sosialisasi KTSP Sosialisasi KTSP CONTOH DAPAT DARI KASUS/GAMBAR YANG RELEVAN DENGAN KD Langkah-langkah : Guru mempersiapkan gambar-gambar sesuai dengan tujuan pembelajaran Guru menempelkan gambar di papan atau ditayangkan melalui OHP Guru memberi petunjuk dan memberi kesempatan...
• The argument is clearly another inductive, ampliative inference: precisely the sort whose justification is in question. The Problem of Induction Reading: 'The Problem of Induction' by W. Salmon Induction and science We've seen that Popper denies that there is a...
• Roger Hart popularized the Ladder of Youth Participation in 1992.Hart's ladder has Manipulation, Decoration and Tokenism representing youth having no power, and moving toward consultative roles and eventually youth- adult partnerships as you progress up the ladder ...
• the database and Database Management System (DBMS). 8/27/2012. ... Components of DBMS Environment. Hardware. Can range from a PC to a network of computers. Software. DBMS, operating system, network software (if necessary) and also the application programs.
• both time derivatives are unimportant, and Maxwell's Equations split into decoupled electrostatic and magnetostaticequations. Electro-quasistatic . and . Magneto-quasitatic . systems arise when one (but not both) time derivative becomes important. GAUSS. GAUSS. FARADAY.
• Class 2 Measurement Terminology and Locating Specific Measures October 1, 2009 Anita L. Stewart Institute for Health & Aging University of California, San Francisco*
• Language Change LING 100 How does language change proceed? We've seen how language families spread and interact How languages constantly change, and diverge when separated Language Change What actually changes? phonetics phonology morphology syntax Semantics We're talking primarily about internally...
• Critical Thinking Knowledge of how we reason and make decisions Able to recognize distracting stimuli, propaganda, irrelevance Recognition of eccentric and sociocentric thinking Intellectual humility To know and understand cognitive and affective bias Able to identify, analyze, and challenge assumptions...