CHM 101 Chapter Notes - Chapter 2: Radiography, Aneityum, Sulfide
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4 a previouslawsusedto develop9 those involvesonlytheseparation combination orrearrangement. Radioactivity spontaneousemissionofparticlesand or radiation somerays areproducedbydecay orbreakdown ofradioactivesubstances some aredeflectedbyoppositelychargedmetalplates. Gamma f raysarehighenergyw nochargesonotaffectedbyexternalfields theprotonandthe. nu atomscontain electronsand areelectricallyneutral therefore have anequal ofpositive negativecharges. Thomsonproposedtheatom was uniformpositivespheres of matter in which electrons areembeddedplumpudding. Atypicalatomic radius is about100pm nucleusisonly i 5 103pm. Somethingwas missingin experimentratios2 neutrons electricallyneutralparticleshavinga mass slightlygreaterthanthat ofprotons neuro proions givenonexamsin. 2 ba omicnumber massnumber and1sotope thenumberofprotons in thenucleus is theatomicnumber 2. M 5 atomic examples atomic neutrons protons protons orelectrons f x mass. Yina mass ll p ll e ii n 9. Ina mass 22 atomica ll p ll e li n ii. 2. 4theperiodic. la elementswith similar chemicalandphysicalpropertiesare groupedtogether n s men s g p horizontalrows areperiodsverticalcolumnsare groupsorfamilies elementscan bedividedintometals nonmetals andmetalloids p per e p y a ch. 2 sn oleculesandions ions only six elementsnaturallyexist assingleatoms most are molecules orions. Molecuies amoleculeis 2t atomsheldtogetherbychemicalbonds diatomicmoleculeshaveonly2 atoms polyatomicmoleculeshavemorethan 2atoms anatomor groupofatomsthat has anetpositiveornegativecharge thelossofelectronsfromaneutralatomresults in a cation aniconwith a netpositivecharge example.
