Chapter 2 - Biology 002 Chapter 2 * CHEM * AIDS Acquired...

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Biology 002 Chapter 2 * CHEM * AIDS Acquired Immunodeficiency Syndrome HIV Virus Matter Anything that takes up space and has mass Element o A simple uncombined substance Metals Non-metals 92 natural 93 up – manmade Atom Smallest part of an element that retains its properties o Nucleus Protons (+) Mass of 1 AMU (atomic mass unit) Neutrons (o) Mass of 1 AMU
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Determines nuclear properties o Electron Electron cloud Electron o (-) o 2000 e- = 1 proton o Determines chemical properties Octet Rule o 8 e- in outer shell 12 C – atomic mass (protons and neutrons) 6 C – atomic # = protons = electrons Isotope Atoms of the same element Different mass (# of neutrons) Same chemical properties 12 C 13 C 14 C – radioactive decay - (all have 6) P: 6 6 6 N: 6 7 8 E: 6 6 6 Half Life (T 1/2 ) Time required to have ½ atoms to decay T 1/2 14 C = 5,000 yrs o 16 disintegrations/g of carbon
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Chapter 2 - Biology 002 Chapter 2 * CHEM * AIDS Acquired...

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