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Atoms StudyGuide 7thgrade A. Themodernatomicmodelisbasedontheprinciplesof_____________________. B. Greekphilosopherswhostudiedthesmallestparticlesofmatterwerecalled ________________. C. Theatomictheoryofmatterwasdevelopedby___________________. D. Thepositivelychargedparticleinthenucleusofanatomisthe________________. E. ThepassageofanelectriccurrentthroughagaswasusedbyJ.J.Thompsonin experimentsthatledtothediscoveryofthe___________________. F. Thenucleusofanatomwasfirstdiscoveredby_________________________. G. Thetheorythatelectronarelocatedinspecificenergylevelswasfirst proposedby_______________________. H. Thenumberofprotonsinthenucleusiscalledthe______________________. I. Thesumoftheprotonsandneutronsinthenucleusofanatomiscalledthe ________________________________. J. Radioactivedecayiscausedbythe___________________________. K. The______________________isthecenteroftheatom. L. Atomsofthesameelementthathavethesamenumberofprotonsbut differentnumberofneutronsarecalled_______________________. M. Thesubatomicparticlesthatareneutralarecalled___________________________. N. A(An)________________________isthenegativelychargedparticle. O. Accordingtothemodernatomictheory,_______________________canmovefrom oneenergyleveltoanother. P. A___________________“glues”theprotonstogetherinthenucleus. Q. _____________________________istheforceofattractionwhichexistsbetweenall objects. R. Theparticlessmallerthananatomarecalled_____________________particles. S. Theatomic________________ofanelementneverchanges. Name AtomicNumber MassNumber Hydrogen 1 1 Helium 2 4 Carbon 6 12 Nitrogen 7 14 Oxygen 8 16 Fluorine 9 19 Sodium 11 23 Aluminum 13 27 Sulfur 16 32 T. Howmanyneutronsarefoundinanatomofaluminum? U. HowmanyprotonsarefoundinanatomofFluorine? V. Whatunitisusedtomeasurethemassofanatom? W. Explainwhycarbonhasamassnumberof12andanatomicmassof12.011.