Partial preview of the text
Download Complete notes About the atomic structure and more Study notes Chemistry in PDF only on Docsity!
ATOMIC STRUCTURE SESSION -1 AIA 1) To introduce Fundamental particles 2) To introduce Thomeon’s and Ruthergord Atomic modal 3) To introduce terme like atomic number, matt humber ahd itotoper, isobart, isotonar John Dalton coined the term atom. The atom is the gundamental particle o¢ matter and considered to be indivisible and indestructible. Ingact, the atom at the whole is electrically neutral at number og pretent in it it equal to number o¢ electrons. The electron, proton and neutron are the maih gundamental particles og ah atom. 7 Dircovery o¢ alectron — itudy og Cathode rayte Jid. Thomton cbcerved that, when a high veltage it applied between the electroder gitted in discharge tube,at a very low pretture,iome invitibla radiations ara emitted grom the cathede. ft this ttage wall v¢ the discharge tube hear cathode ttarte glowing. Gos atl discharge tube ‘Prditure Faint greah glo 223 Cathede rays 4h Tidal pimp Ditcharge tubs sxparimant — praduction #¢ cathe rayne Glowing is due to the bombardment 0€ qlar wall by the cathode rayt. It may be noted that when the gas pretture in the tube ir 1 atm, ho electric current glows through the tube. Thir ir becaure the qacer are poor conductor o€ alectricit y. Hearse reer cere SETS | |_| | RoE OSS | 
