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Periodic tableIn the modern periodic table, elements are arranged by increasing atomic number (number of protons).

Dmitri Mendeleev

Father of Periodic TableTook the elements and organized them by their properties and masses, and recognized that they had a repeating pattern as the masses increased.

Horizontal rows—periods

Vertical columns—families or groups

Metals

good conductors of electric current and heat. solids at room temperature. Except for mercuryMalleable-hammered into thin sheets. ductile--drawn into thin wires.

Form positive ions when bonding

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Transition Metals

elements that form a bridge between the elements on the left and right sides of the table. Form positive ions when bonding

Nonmetals

poor conductors of heat and electric current. low boiling pointsmany are gases at room temperature. solids at room temperature are brittle. Form negative ions when bonding

Metalloids

elements with properties that fall between those of metals and nonmetals Form positive/negative ions when bondingGood heat conductors, poor electricity conductors

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Rare Earth elements

Numbers 57-70, 89-10293 and above are synthetic

SyntheticReactivity

Alkaline Earth: most reactive metals

Halogens: most reactive non metals

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