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Families of Elements. Three Groups of Elements. Metals Nonmetals Semiconductors or Metalloids. Metals. They are shiny solids that can be stretched and shaped. They are good conductors of heat and electricity. Nonmetals. May be solid, liquids or gases.

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Three groups of elements
Three Groups of Elements

  • Metals

  • Nonmetals

  • Semiconductors or Metalloids


Metals
Metals

  • They are shiny solids that can be stretched and shaped.

  • They are good conductors of heat and electricity.


Nonmetals
Nonmetals

  • May be solid, liquids or gases.

  • If a solid nonmetal they are typical dull, brittle and poor conductors of heat and electricity.


Semiconductors
Semiconductors

  • Non-metals that can conduct under certain conditions.

  • Display properties of metals and non-metals.


Concept check
Concept Check

  • Which is it?

    • Oxygen

    • Sodium

    • Silicon

    • Radon


Families within the periodic table
Families within the Periodic Table

  • Alkali Metals

  • Alkaline Earth Metals

  • Halogens

  • Noble Gases


Alkali metals
Alkali Metals

  • Reactive

  • Most of them are shiny

  • Very reactive because it has one valence electron.

  • They want to have full octet.


Alkaline earth metals
Alkaline-earth Metals

  • Less reactive than Alkali metals but can still be very reactive.

  • Reactive to form +2 ions.

  • A lot of them are found in the human body.


Radon
Radon

  • Uranium can degrade into Radon.

  • Radon having similar properties as Calcium can replace it in bones.

  • This caused major issues after Chernobyl


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