Periodic Table of Elements
Nonmetals are crucial elements characterized by their lack of shine, malleability, and ductility, along with poor conductivity. Most nonmetals possess nearly full outer electron shells. Group 17, the halogens, are highly reactive elements with seven outer electrons, known for forming salts when reacting with alkali metals. Group 18 consists of noble gases, which have full outer shells (except helium), making them unreactive and colorless at room temperature. Hydrogen, with its single electron, is highly reactive and forms explosions with oxygen. Discover the fascinating characteristics of these essential elements!
Periodic Table of Elements
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Presentation Transcript
Periodic Table of Elements Nonmetals
Nonmetals • Properties of nonmetals: • Not shiny • Not malleable (not bendable) • Not ductile • Poor conductors • Atoms of almost all nonmetals have almost full outer shells
Group 17: Halogens • Properties of halogens • 7 electrons in the outer shell • Very reactive • React violently with alkali metals to form salts • Poor conductors of electric current • Never found uncombined in nature
Group 18: Noble Gases • Properties of noble gases: • 8 electrons in the outer shell (except helium) • Unreactive (do not react with other elements under normal circumstances) • Colorless and odorless gases at room temperature • Found in small amounts in the earth’s atmosphere
Hydrogen Stands Alone • Properties of hydrogen: • One electron in the outer shell • Reactive • Reacts explosively with oxygen • Odorless and colorless gas at room temperature • Low density
