Austin High School 2016 Bonding Ms. Lizette Gutierrez Electron Glue Austin High School 2016 Bonding Ms. Lizette Gutierrez

ChemCatalyst Hello Chemistry Student: Shade in the metals on this Periodic Table. Identify whether these are Metals or Non-Metals : Ca P Ag At Ne In Mg H Hello Chemistry Student: You will need your notebook and a copy of the lab. Complete the following ChemCatalyst, writing your answers on the lab paper.

What is the Purpose of Today’s Activity? To investigate the different types of bonding found in substances and to relate bonding to the physical properties of substances.

What is a Chemical Bond? An attraction between atoms that hold them together in space. Four Types of chemical bonds: Ionic Bond Network Covalent Bond Metallic Bond Molecular Covalent

Types of Bonds

Ionic Bonding A type of chemical bonding that is the result of transfer of electrons from one atom to another. The gray shading shows that the valence electrons are concentrated around the nonmetal atoms. The strong attraction between the oppositely charged ions is the force that holds the ions together in the compounds. This force of attraction makes ionic solids fairly hard, although they are brittle and will shatter when struck hard Ionic solids dissolve in water. The atoms that makeup the compounds remain ion, but the individual ions separate from one another Once dissolved they will conduct electricity

Network Covalent Bonding A type of chemical bond in which one or more pairs of valence electrons are shared between the atoms. Covalent bonding can be molecular covalent or network covalent. Valence electrons are “shared” among atoms In network covalent bonding, valence electrons are shared among atoms throughout the substance Very uniform and durable structure Typically solid at room temperature Very hard and do not dissolve in water Valence electrons are not free enough to move about the substance and conduct electricity

Metallic Bonding A bond between metal toms in which the valence electrons are free to move through the substance. Metal atoms surrounded by a “sea” of valence electrons Metals are hard but bendable and malleable Usually dent when hit with a hammer They are ductile (made into wire) They conduct electricity Distribution of the valence electrons throughout the substance allows the electrons to move freely

Molecular Covalent Bonding A type of chemical bond in which one or more pairs of valence electrons are shared between the atoms. Covalent bonding can be molecular covalent or network covalent. Valence electrons are shared among the atoms Unlike the atoms in network covalent substances, atoms in molecular covalent substance are not connected throughout the substance Atoms are connected in many identical units called molecules Units may be composed of only two atoms or they may be composed of dozen of atoms Substances are often gases or liquids at room temperature