Basic Chemistry

Basic Chemistry - Basic Chemistry of Living Systems...

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Basic Chemistry of Living Systems Matter-anything that occupies space and has mass (weight) -All matter is composed of elements -90% of the body is made up of C, N, O and H Atoms-smallest unit of an element that still retains the chemical and physical proper- ties of the element Protons-positive charge, 1 atomic unit, in nucleus Neutron-neutral charge, 1 atomic unit, in nucleus Electron-negative charge, 0 atomic units, electron cloud (Inner shell can hold up to 2-/ others up to 8-) Atomic Number=Protons Atomic Weight=Protons+Neutrons Isotopes-same type of atom with varying numbers of neutrons Radioactive Isotopes-same type of atom with varying numbers if neutrons and can be used as a tracer 131 Iodine-used to check the condition of the thyroid gland PET-a way to determine comparative activity of tissues. Ability of radiation to kill cells is often applied to cancer cells H2 N2 O2 Hydrogen Gas Nitrogen Gas Oxygen Gas Compound-different atoms bond together
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This note was uploaded on 02/25/2012 for the course CHEM 1341 taught by Professor Compton during the Fall '08 term at Texas State.

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Basic Chemistry - Basic Chemistry of Living Systems...

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