1.13 BiSci 001 - BiSci 001 Wednesday January 13th 1999...

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BiSci 001 Wednesday January 13th 1999 Announcements: None Lecture notes: Levels of Organization in Nature Biosphere ^ Ecosystem ^ Community ^ Population ^ Multicellular Organism ^ Organ System ^ Organ ^ Tissue ^ Cell ^ Organelle ^ Molecule ^ Atom ^ Subatomic Particle Elements and Atoms Elements : are materials that cannot be broken down into components with different properties. Elements combine in fixed ways to form compounds (like molecules of water) Mixtures : combinations of two or more elements of compounds mixed in similar
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but variable amounts. Examples: sea water and air. Atoms are the smallest portion of an element that still retains the properties of that element. Parts of an atom: 1. Nucleus: the "core" of the atom. a. contains: protons (+ charge) b. contains: neutrons (0 charge) c. contains almost all of the mass of the atom. 2. Electrons: shell of the atom. a. electrons have a - charge b. the electron cloud occupies almost all of the volume of the atom. 3. All neutral atoms have the same number of protons as electrons making
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This note was uploaded on 02/21/2008 for the course BI SC 001 taught by Professor Schlegel during the Spring '99 term at Pennsylvania State University, University Park.

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1.13 BiSci 001 - BiSci 001 Wednesday January 13th 1999...

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