Metals
Goal of the class To understand the common chemical and physical properties of metals. Question of the day: What about metals atomic structure contribute to it’s chemical and physical properties? Previous Answer: There is 1 mole of atoms in 55g of iron. Previous question: How many atoms are in 55g of Iron?
Metals Most of the elements on the periodic table are types of metals All of the blue elements are metals
Metals Metals have common chemical and physical properties These characteristics are due to the arrangement of their atoms Metal atoms will be arranged in a regular pattern
Metal Structure Metals form giant structures in which electrons in the outer shells of the metal atoms are free to move. The metallic bond is the force of attraction between these free electrons and metal ions. Metallic bonds are strong, so metals can maintain a regular structure and usually have high melting and boiling points. Conductivity is both thermal and electrical
Conductivity Metals make good conductors of electricity and heat. Electric current is just electrons flowing in one direction The valence electrons of the atoms flow from atom to atom Thermal conductivity is due to the structure of the metal As the atoms get more thermal energy, that energy is transferred to other atoms near by Conductivity is both thermal and electrical
Metal shaping Malleability is the property of how it deforms when hit or pressed. Ductility is how it can be stretched (typically for wires) Metal atoms will slide past each other under pressure The electromagnetic fields hold the metal together so it doesn’t break
Reactivity Reactivity is the property of how likely an element will react Some metals are very reactive while others react under very specific conditions Depends on how easy the valence electron can be taken Corrosion is a type of reaction
Questions How can ductility and malleability be useful properties? What properties of metals led to plastic or wooden handles on cooking utensils? Why? lanthanides and actinides
Vocabulary Delocalize – To contain the electron in an orbital that extends over several atoms Deform – to change shape caused by stress
Homework Read: Chemical Building Blocks page 90-93 Please complete Chemical Building Blocks workbook page 39-40 http://phet.colorado.edu/en/simulation/build-an-atom