Elements
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Elements! PowerPoint PPT Presentation


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Elements!. Elements. A pure element is made of many of the same atoms. Common elements- Aluminum, Oxygen, Carbon (about 100 others) Elements cannot normally be broken apart into smaller substances. Demitri Mendeleev- Russian chemist who developed the first periodic table in 1869.

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Elements!

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Elements

Elements!


Elements1

Elements

  • A pure element is made of many of the same atoms.

  • Common elements- Aluminum, Oxygen, Carbon (about 100 others)

  • Elements cannot normally be broken apart into smaller substances

Demitri Mendeleev- Russian chemist who developed the first periodic table in 1869.

The periodic table organizes elements by common characteristics!

http://serc.carleton.edu/images/usingdata/nasaimages/periodic-table.gif

http://www.germes-online.com/direct/dbimage/50327532/Aluminum_Alloy_Pipe.jpg

http://www.jinshanmines.com/i/photos/Jinshan_GoldBar.jpg


Atomic model and subatomic particles

Atomic Model and Subatomic Particles

  • Atomic Model has changed dramatically through history

  • Subatomic particles make up all atoms

Subatomic particles


Protons

Protons

  • Found in the nucleus (center of atom)

  • The electric charge is positive (+)

  • Weighs 1 amu

    (atomic mass unit)

  • Each element has a unique number of protons (All Oxygen atoms have 8 protons; all Iron have 26)

Atoms are identified by their number of protons.


Neutrons

Neutrons

  • Also makes up part of nucleus

  • No electric charge

  • Weighs 1 amu

  • Number of neutrons in the nucleus can change (Isotopes)


Electrons

Electrons

  • Found surrounding the nucleus in energy levels

  • Negatively (–) charged particle

  • Weighs 1/2000 amu

  • At one time thought to be nuclear garbage. Now, the most important part of chemistry

  • VIP of Chemistry


Electron energy levels

Electron Energy Levels

  • Electrons have energy (they have motion)

  • Electrons surround nucleus in energy levels

  • Electrons fill the lowest energy level first which is closest to the nucleus


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