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Periodic Table/Elements August 16

Periodic Table/Elements August 16. How many significant figures does 9.0003 have? How many significant figures should the product of 10.3 x 2.3 have? [ 10 (power 4) + 10 (power 3) ] ÷ 10 (power ­2). Elements. 73% Hygrogen 25% Helium 2% everything else. Elements.

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Periodic Table/Elements August 16

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  1. Periodic Table/ElementsAugust 16 How many significant figures does 9.0003 have? How many significant figures should the product of 10.3 x 2.3 have? [10 (power 4) + 10 (power 3) ] ÷ 10 (power ­2)

  2. Elements

  3. 73% Hygrogen 25% Helium 2% everything else

  4. Elements • Periodic Table of the Elements • The vertical columns of the periodic table are called groups, or families • Each group contains elements with similar chemical properties • The horizontal rows of elements in the periodic table are called periods • Physical and chemical properties change somewhat regularly across a period

  5. Elements • Types of Elements • Metal is an element that is a good electrical conductor and a good heat conductor • Properties of metals • Most are solids at room temperature • Malleable - they can be hammered or rolled into thin sheets • Ductile - they can be drawn into a fine wire • Conduct electricity and heat well

  6. Alkali Metals:Group 1 in the periodic table. -soft, white, low-density, low-melting point -highly reactive metallic elements -lithium, sodium, potassium, rubidium, cesium, and francium. -one electron in the outermost energy level -never found free in nature.

  7. Periodic Table/ElementsAugust 17 How many significant figures does 1005.03 have? How many significant figures should the product of 10.30 x 2.30000 have? [10 (power 4) + 10 (power 4) ]x 10 (power 2)

  8. Alkaline Earth Metals: Group 2 in the periodic table. -metallic elements calcium, strontium, magnesium, and barium, but generally including beryllium and radium. -two electrons in the outermost energy level, readily reactive -never found free in nature.

  9. Transition Metals: Any of the metallic elements within Groups 3 to 12 in the periodic table -multiple valences (outermost electron rings)

  10. Elements Gold Copper Aluminum Types of Elements

  11. Elements • Types of Elements • Nonmetal is an element that is a poor conductor of heat and electricity • Properties of nonmetals • Many are gases • Solids are brittle • Poor conductors of heat and electricity

  12. Elements Carbon Sulfur Phosphorus Iodine • Types of Elements

  13. Elements • Types of Elements • Metalloid is an element that has some characteristics of metals and some characteristics of nonmetals • Properties of metalloids • All metalloids are solids at room temperature • Semiconductors of electricity

  14. Halogens: Group 17 in the periodic table. -five chemically related nonmetallic elements -fluorine, chlorine, bromine, iodine, and astatine -highly reactive and combine readily with most metals and nonmetals to form a variety of compounds -never occur uncombined in nature.

  15. Elements • Types of Elements • Noble gases are the elements in Group 18 of the periodic table of the elements • Properties of noble gases • Generally unreactive • Gases at room temperature

  16. Elements Types of Elements

  17. Lanthanide Metals: Elements representing atomic numbers 57–61 in the periodic table. They are shiny metals, similar in reactivity to alkaline earth metals. • Actinide Metals: A series of radioactive metallic elements in Group 3 of the periodic table.

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