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Lecture 1

BIOL 1201 Lecture Notes - Lecture 1: Unified Atomic Mass Unit, Electronegativity, Covalent Bond


Department
Biological Sciences
Course Code
BIOL 1201
Professor
E William Wischusen
Lecture
1

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I. Scale of Nature
a. Biologists Interested In
Atomic 10-8
Community/Ecosystem 106
a. Approaches
i. Reductionist
i.1. Smallest to Largest
ii. Wholist
i.1. Whole system/state
b. Atomic Structure Important
i. Organisms are composed largely of 11 basic elements
i.1. Value of average human $1,000
i.2. Difference
i.1.a. How you are organized
b. What determines Solubility?
c. What determines Polarity?
I. Atoms
a. Smallest unit of matter separable by normal chemical means
a.i. Smallest unit of matter that retains all of the properties of that element
b. Subatomic Particles
Particles Mass Charge
Proton 1 dalton +1
Neutron 1 dalton 0
Electron ~0 dalton -1
a. Atomic Number & Mass
i. Atomic Number
i.1. Number of protons
ii. Atomic Mass
i.1. Number of protons and neutrons
ii. Isotopes
i.1. Variants of an atoms
i.2. DIFFERENT number of neutrons, SAME protons
Element Protons Neutrons Electrons Atomic # Atomic Mass
Hydrogen 1 0 1 1 1
Helium 2 2 2 2 4
Carbon 6 6 6 6 12
Carbon14 6 8 6 6 14
Nitrogen 7 7 7 7 14
Oxygen 8 8 8 8 16
a. Basic Structure of Atom
i. Inner Shell
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