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Ionic Bonding.

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Presentation on theme: "Ionic Bonding."— Presentation transcript:

1 Ionic Bonding

2 New Unit: Chemical Bonding
Essential Questions: What are the processes by which different atoms come together to form new compounds and what forces hold solutions of these compounds/molecules together?

3 Ions An atom with a charge Positive: cation Negative: anion
How do these atoms become charged?

4 Valence Electrons Electrons in the highest occupied energy level
The number of valence electrons greatly determines chemical properties of an element and how it will react How can we find the number of valence electrons in an element?

5 By using electron configurations
Electron configuration for chlorine: 1s22s22p63s23p5 What is the highest energy level reached? 3 How many electrons are there? 7

6 Because of trends, we can also use group numbers!
Looking at the electron configuration for elements in the same group, they will all have the same number of valence electrons (just the A groups though! Not the B groups.)

7 Guided Practice on Valence Electrons
How many valence electrons are there in the following elements? Chlorine Calcium Aluminum Carbon Neon

8 Electron Dot Structures
Also known as Lewis Structures Diagrams that represent the number of valence electrons in the atom Find number of valence electrons Write element symbol Fill valence electrons around symbol, one on each side first then double up

9 Guided Practice on Lewis Structures
Find the Lewis Dot Structures for the following elements: Chlorine Calcium Aluminum Carbon Neon

10 Octet Rule Noble gases are the most stable elements on the Periodic Table due to the fact that they have 8 valence electrons (a complete outer shell) Atoms will either lose or gain electrons through bonding in order to attain those complete 8 configurations Metal elements tend to lose electrons while nonmetals tend to gain

11 Forming ions How do cations form? How do anions form?
Losing valence electrons Who tends to form cations? How do anions form? Gaining valence electrons Who tends to form anions?


13 Forming cations Metals Lose valence electrons Example: Calcium
Normal calcium calcium ion 20 protons 20 protons 20 electrons 18 electrons no charge +2 charge

14 Forming anions Nonmetals Gain electrons to get to an octet
Example: Chlorine normal chlorine chlorine ion 17 protons protons 17 electrons 18 electrons no charge charge

15 Independent Practice

16 Formation of Ionic Compounds
Composed of a cation and an anion Held together by ionic bonds Represented by a chemical formula A formula unit is the lowest whole-number ratio of ions in an ionic compound

17 Formation of Ionic Compounds
When writing the formulas, use the criss-cross method Mg Cl-1 MgCl2

18 Showing Ionic Bonding with Lewis Structures

19 Showing Ionic Bonding with electron configurations

20 Guided Practice on Ionic Compound Formulas
For the following pairs of elements, write the formula for the ionic compound formed Aluminum and Chlorine Sodium and Sulfur Nitrogen and fluorine

21 Independent Practice

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