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Lesson planSubject- science Topic- structure of atom Submitted to: Mrs. Amandeep kaur Submitted by: SONAMRoll no. :90 D.A.V College of education, FazilkaPK TESTINGQ: List any five objects around you.Q: What name can be given to all these objects ?Q: What is matter made up of ?Q: What are molecules made up of?Q: What is the structure of the atom?Topic : structure of atomAtom- The smallest unit of an element that can take part in chemical reaction.Atoms have three types of subatomic particles.Subatomic Particles

Discovery of subatomic particlesElectrons- In 1900, J.J.ThomsonProtons-In 1886, E.GoldsteinNeutrons-In 1932, chadwickModels of atomsDaltons atomic model (1808)Thomsons model (1904)Rutherfords model (1911)Bohrs model (1913)Quantum mechanical model (present)Daltons modelAtoms are the indivisible particles and are the fundamental building blocks of matter . Dalton envisioned atoms as hard, solid spheres.

Thomsons model Sectional recapitulationQ: Define atom.Q: Name the subatomic particles.Q: What is the other name of Thomsons model?Rutherfords model

Rutherfords model of an atom :-

Defects of Rutherfords model of the atom :-

Bohrs modelShells or energy levels in an atom

13Final recapitulationQ:Name the particles used in Rutherfords scattering experiment. Q:What is the drawback of Rutherfords model of atom?Q:Explain Bohrs model of atom.Q:Who discovered electron?HomeworkDraw the diagram of atom according to every model.ThanksParticleMass

(g)Charge (Coulombs)Charge (units)

Electron (e-)9.1 x 10-28-1.6 x 10-19-1

Proton (p)1.67 x 10-24+1.6 x 10-19+1

Neutron (n)1.67 x 10-2400