chapter 2 review

chapter 2 review - Lecture 3: Chapter 2 Atoms & Molecules:...

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A. Important Elements Carbon, things (about 96% of mass) 1. Carbon backbone of organic molecules 2. Hydrogen component of water 3. Nitrogen component 4. Oxygen required for cellular respiration component of water B. Atom 1. Nucleus contains 2. Electrons () surround nucleus Each atom is a particular element identified by the number of protons (atomic number) C. Atomic Mass sum D. Atomic Mass Unit Mass of a single proton or neutron Mass of an electron about 1/1800 of an A.M.U. Atomic subscript; ex. 16 8 O E. Isotope different number of neutrons and therefore a different mass
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Unstable isotope goes through process of decay to stable isotope, by emitting radiation ( ϐ particles) F. Orbitals Electrons move rapidly in electron orbitals outside the nucleus 1. Electron shell – electrons in orbitals with similar energies, said to be at the same principal energy level 2. Valence electrons most energetic electrons, which occupy the valence shell represented as the outermost concentric ring in a Bohr model An atom tends to lose, gain, or share electrons to fill its valence shell, when not full II. Chemical Reactions A. Molecules A molecule consists of atoms joined by covalent bonds The molecular mass of a compound is the sum of atomic masses of its component atoms for each single molecule The amount of an element or compound whose mass in grams is equivalent to its
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This note was uploaded on 01/18/2012 for the course BIO 101 taught by Professor Martin during the Fall '08 term at Rutgers.

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chapter 2 review - Lecture 3: Chapter 2 Atoms & Molecules:...

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