3 MetalsMetal – an element that is a good electrical conductor and a good heat conductor.4 Physical properties of metalsMalleable – can be pounded into shapesDuctile – can be pulled out into long wiresMetallic luster – silver greyHardness – varying hardness
5 MalleableMalleable – ability to be pounded into shapes.
6 Ductile Ductile – ability to be drawn out into a thin wire.
7 Metallic Luster Most metals have a silver/grey luster (or shine) Gold (Au) and Copper (Cu) – yellow/reddish brown luster
8 Hardness Hardness varies Some can be cut with a butter knifeOthers are VERY hardMost metals have a high melting point – meaning they are solids at room temp.Mercury (Hg) is the only exception (liquid)
9 Metal Chemical Properties Reactivity – ability of an element to undergo a chemical change, heat is released.Na and K very reactive, quickly react (Group 1)Au and Cr not very reactive, react slowlyCorrosion – deterioration of metals due to reaction with oxygen (Ex. Rust, tarnish)
10 MetalloidsMetalloids – elements with some characteristics of metals and others of nonmetals.All are solid at room tempUsed as semiconductors found in electronics
11 NonmetalsNonmetal – a poor conductor of heat and electricity. (Opposite of a metal) Most are gases at room temperature (low boiling point) A few solids (C, I) – very brittle One liquid (Br)