Types of Bonds Unit 4 Topic 2

Ionic Bonding An Ionic bond forms when two atoms exchange electrons

Ions The atom which loses electrons, forms a positive ion, (cation) and is a metal The atom which gains electrons, forms a negative ion (anion) and is a nonmetal.

Metal + Nonmetal Ionic bonds form between a metal atom and a nonmetal atom. The ions in the crystalline solid are held together by strong attractions between the oppositely charged ions that make up the compound. HIGHLIGHT THIS!

Metal + Nonmetal The formulas for ionic compounds are determined by balancing out the charges on the ions. The ionic compound must be balanced so that the net charge is zero.

Naming Ionic Compounds To name ionic compounds that contain only two types of elements, the element name of the positive ion is followed by the element name of the negative ion changing the ending of the second element to “ide” Example: CaCl2 = Calcium Chloride

Covalent Bonding A Covalent bond forms when two atoms share electrons Sharing is Caring (C for covalent)

Sharing Two atoms will share their valence electrons. They share because neither element has enough pull to take an electron away from the other. Sharing involves an overlapping of the outermost energy level between the two atoms.

Sharing The atoms will share electrons in order to fill their valence shell (to have 8 electrons) Hydrogen is the exception, it is filled when it has two electrons because it is in the first principle energy level or first row of the periodic table.

Nonmetals Covalent compounds form between two nonmetal elements (nonmetal + nonmetal)

Formulas Formulas for covalent compounds can be predicted using electron dot diagrams (Lewis Dot Diagrams). Nonmetal compounds will share valence electrons until they obtain eight total electrons, the octect rule (hydrogen being the exception)

THIS HAS ANIMATION! O H H

Identify Categorize the following as Ionic or Covalent: KF Na2O BF3 H2 AlBr3 BF3 Cl2 BeS NH3 MgI2 CH4

Identify Categorize the following as Ionic or Covalent: KF Na2O BF3 H2 AlBr3 BF3 Cl2 BeS NH3 MgI2 CH4

Metal vs Nonmetals Color a new periodic table in your coloring book. This example has more elements than your periodic table.

The End!