On the periodic table, metals are found to the left of the zigzag staircase (except hydrogen). Metals are shiny, malleable, ductile, and good conductors.
Group 1 (alkali metals) are the most reactive metals.
Group 2 (alkaline earth metals) are shiny and reactive.
Transition metals (Groups 3–12) include many common metals.
Lanthanides and actinides are found at the bottom of the table.
Nonmetals are found to the right of the zigzag staircase. They are usually dull, brittle, and poor conductors.
Halogens (Group 17) are very reactive.
Noble gases (Group 18) are stable because their outer energy level is full.
Hydrogen is a nonmetal located on the left because it has only one valence electron.
Metalloids lie along the zigzag line and have properties of both metals and nonmetals. They are semiconductors and are used in technology, such as silicon in computer chips and germanium in solar panels.
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