Transcription of The Free High School Science Texts: A Textbook for High …
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TheFreeHighSchool ScienceTexts:A TextbookforHighSchool Students , 20051 2003\FreeHighSchool ScienceTexts"Permissionis grantedto copy, distributeand/ormodifythisdocu-ment underthetermsof theGNUFreeDocumentationLicense, any laterversionpublishedby theFreeSoftwareFoun-dation;withnoInvaria nt Sections,noFront-Cover texts ,andnoBack-Cover copy of thelicenseis includedin thesectionentitled\GNUFreeDocumentationL icense".iContentsIMATTERANDMATERIALS11 Classi cationof Materials(Grade10)22 Whatis mattermadeof? (Grade10)33 TheAtom(Grade10) theatom.. Model/ QuantumMechanicalModel.. guration.. of ionizationenergyto supportatomarrangement inPeriodicTable.. ionisationenergiestoprovideevidenceforar range-ment of electronsinto coreandvalence..94 Atomiccombinations,Molecularstructure,Ch emicalBonding(Grade11) .. a molecule?.. of bonding.. bonding.. molecularstructure..165 Atomicnuclei(Grade11) theatommadeof?
3.1.1 The Plum Pudding Model After the electron was discovered (by J.J. Thomson in 1897), people realised that atoms were made up of even smaller particles and the plum pudding model
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