Atoms and the Periodic Table / Elements and the Periodic Table * An element is a pure substance that cannot be broken down into simpler substances by a chemical reaction.
* Each element is identified by a one- or two-letter symbol.
* Elements are arranged in the periodic table.
* The position of an element in the periodic table tells us much about its chemical properties.
Atoms and the Periodic Table / Elements and the Periodic Table
Atoms and the Periodic Table
Atoms and the Periodic Table / Metals, Nonmetals, and Metalloids * The elements in the periodic table are divided into
three groups—metals, nonmetals, and metalloids.
* are located on the left side of the periodic table
* usually exist as shiny solids
* are good conductors of heat and electricity
* are solids at room temperature, except for mercury (Hg), which is a liquid
Atoms and the Periodic Table / Metals, Nonmetals, and Metalloids Nonmetals:
* are located on the right side of the periodic table
* usually do not have a shiny appearance
* are usually poor conductors of heat and electricity
* can be solids, liquids, or gases at room temperature
solid liquid gas sulfur bromine nitrogen carbon oxygen
Nonmetals, and Metalloids
* are located on the solid line that starts at boron
(B) and angles down towards astatine (At)
* have properties intermediate between metals
* are represented by only seven elements:
boron (B) antimony (Sb) silicon (Si) tellurium (Te) germanium (Ge) astatine (At)