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Elements!

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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  1. Elements!

  2. 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

  3. Atomic Model and Subatomic Particles • Atomic Model has changed dramatically through history • Subatomic particles make up all atoms Subatomic particles

  4. 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.

  5. Neutrons • Also makes up part of nucleus • No electric charge • Weighs 1 amu • Number of neutrons in the nucleus can change (Isotopes)

  6. 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

  7. 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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