19.1A. Mass–Energy Relationship 2020-MZ (1).pdf - 2020/5/2...

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2020/5/21Chapter19:NuclearChemistry19.1Mass–EnergyRelationshipinNucleiContentsNuclearChemistryWewilllookattwotypesofnuclearreactions.Radioactive decayis the process in whicha nucleus spontaneously disintegrates,giving off radiation.Nuclear bombardmentreactions arethose in which a nucleus is bombarded, orstruck, by another nucleus or by a nuclearparticle.NuclearChemistryReview‐ NucleusNucleonsSubdividedintoneutronsandprotonsComposedofsmallerparticlescalledquarksAtomicnumber(Z):NumberofprotonsinanucleusMassnumber(A):SumofprotonsandneutronsinanucleusIsotopes:Atomswithidenticalatomicnumbers(samenumberofprotons)butdifferentmassnumbervalues41234
2020/5/22Review‐ NuclideEachatomisuniquelyrepresentedbythefollowingsymbol:X‐ SymboloftheelementA‐ MassnumberZ‐ Atomicnumber5XAZ6Review:AtomicMassUnit(amu)In1804,therelativeatomicmasswassuggestedbyJohnDaltonas1H.In1903,WilhelmOstwaldsuggesteditwouldbethebesttoexpressitintermsofunitsof1/16massofoxygen,16O.Thediscoveryofisotopicoxygenin1929ledtoadivergenceinrelativeatomicmassrepresentationIn1961,bothinphysicsandchemistrywaschangedto carbon‐12,12CThenewandcurrentunitwasreferredtoasthe"unifiedatomicmassunit"(u)toreplacetheold"amu“.TheDalton(Da)isanothername.7Review:AtomicMassUnit(amu)1Atom12Chasmassof1.9924*10‐26kg1212‐26‐27massofanatom C1amu12(thenumberofnucleonsin C)1.992410kg=12=1.660510kgReview‐ IsotopesIsotopes

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Term
Fall
Professor
DINNER
Tags
Atom, Proton, Mass, Neutron, Binding energy

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