BIO 311c ch2 notes

BIO 311c ch2 notes - BIO 311c ch2 notes Elements and...

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BIO 311c ch2 notes Elements and Compounds Element-is a substance that cannot be broken down to other substances by chemical reactions Compound- is a substance consisting of two or more different elements combined in a fixed ratio With compounds comes emergent proprieties Essential Elements of Life 25 of the 92 elements are essential for life. Four include carbon, oxygen, hydrogen, and nitrogen—make up 96% of living matter Trace elements-required by an organism only in minute quantities An Element’s Properties Depend on the structure of its atoms Atom- the smallest unit of matter that still retains the properties of an element We symbolize atoms with the same abbreviation used for the element that is made up of those atoms Subatomic Particles Subatomic particle-what atoms are made up of o Neutrons-neutral o Electrons-negative o Protons-postive Protons and neutrons are packed in the atomic nucleus. Protons give the nucleus a positive charge The electrons form a sort of negative charged cloud Mass of proton and neutron-1.7 X 10^-24 grams Since they are so small they are usually measure in the Dalton (amu) neutrons and protons are one Dalton Atomic Number and Atomic Mass All atoms of a particular element have the same number of protons in the nuclei
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Atomic number-protons. .is written as a subscript to the left of the symbol Atom is neutral in charge (same number of protons and electrons) Mass number-sum of protons and neutrons-superscript to the left
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This note was uploaded on 10/23/2008 for the course BIO 311C taught by Professor Satasivian during the Fall '08 term at University of Texas.

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BIO 311c ch2 notes - BIO 311c ch2 notes Elements and...

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