BIOL100 Dowdy Week2
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This 2 page Class Notes was uploaded by Tiffany Le on Tuesday September 30, 2014. The Class Notes belongs to Biol 100 at a university taught by a professor in Fall. Since its upload, it has received 85 views.
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Date Created: 09/30/14
WEEK 2 BIOL 100 DOWDY Chapter 2 0 ATOMS o 96 of human weight contains 4 ELEMENTS i Carbon ii Hydrogen iii Oxygen iv Nitrogen o Hard to memorize the above Think CHON o Subatomic particles i proton p o heavy measurable mass J the nucleus ii neutron n o heavy i the nucleus no charge iii electron e o negligible mass hella light in weight outside the nucleus o Figuring out the s on the Periodic Table Source of photo Sparknotes E39Iit39CI ni39 l39lIll39ll39FlI1E39ll Iquotr 0 0 Vi EI39EFlTElTlllt l ili1iTIlli l EllIEEl TilIEilquot1 rlarrle ar E 39iIl39lElr39iI 1E39iI 1 atomic weight i Atomic weight is also known as atomic mass ii Number of neutrons atomic mass atomic number iii Isotopes different versions of the same element o example Carbon o Carbon 12 6 protons 6 neutrons o Carbon 13 6 protons 7 neutrons o Carbon 14 6 protons 8 neutrons o Radioisotopes radioactive isotopes Stability only achieved when outermost shell is completely full of electrons o Uses for radioisotopes tracers o can be used to do things like checking for clogged arteries o think of it like marking specific things in the body for scientists to trace its path while moving in the body energy for pacemakers smoke detectors diagnose diseases o thyroid gland produces hormones using Iodine I o hormones the molecules that act as chemical messengers that control speed of metabolism i thyroid scan can be done with radioisotopes ii seafood best natural source of odine Can also be found in table salt irradiate food treating cancer