Properties of the Periodic Table. Periodic Table: Atomic number – the identity of an element Row = Period (Horizontal Rows #1-7) The atomic # increases.

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Presentation transcript:

Properties of the Periodic Table

Periodic Table: Atomic number – the identity of an element Row = Period (Horizontal Rows #1-7) The atomic # increases as you go from left to right Atomic# = # protons (p) = # electrons for a neutral atom Properties change somewhat regularly as you go across Column = Group = Family (Vertical Columns #1-18) Elements in a group have similar chemical properties

Metals, Non metal and metalloids – Summary Table MetalsMetalloidsNon metals

To Review: Metals Common Properties - shiny - good electrical/heat conductor - most are solids (room temperature) - malleable (can be hammered) - ductile (can be drawn into fine wire) - high tensile strength (resist breaking when pulled) Unique Properties - mercury (liquid at room temperature) - Group 1 metals can be cut with a knife - variety of colors

To Review: Nonmetals Common Properties - poor conductors of heat & electricity - not as common as metals Gases (Room Temperature) - nitrogen, oxygen, fluorine, & chlorine Liquids - bromine Solids - carbon, phosphorous, selenium, sulfur, iodine

To Review: Metalloids Common Properties - located between m & nm - share characteristics with m & nm - all solids at room temperature - less malleable than metals - not as brittle as nonmetals - semiconductors of electricity Metalloid Elements - Boron (B), Antimony (Sb), Silicon (Si), Tellurium (Te), Germanium (Ge), Polonium (Po) - Arsenic (As) (debate-also metal)

* Useful for living things in small amts, deadly in large quantities * Red stuff on the tips of matches is P. *78% of the earth's atmosphere made up of N 2, unuseable form

Oxygen is extremely reactive and combines with most other elements