ATOMIC STRUCTURE Notes
3 5MODULE - 2Atomic StructureNotesAtomic STRUCTURE andChemical Bondinghemistry has been defined as the study of matter in terms of its STRUCTURE , compositionand the properties. As you are aware, matter is made up of atoms, and therefore anunderstanding of the STRUCTURE of atom is very important. You have studied in your earlierclasses that the earliest concept of atom ( smallest indivisible part of matter ) was givenby ancient (600-400 BC) Indian and Greek philosophers. At that time there were noexperimental evidence. The origin of the concept of atom was based on their thoughts on What would happen if we continuously keep dividing matter . John Dalton revived theconcept of atom in the beginning of nineteenth century in terms of hisatomic theorywhich successfully explained the laws of chemical combination.
Wavelength : It is the linear distance between two consecutive wave-crests or wave- troughs as shown in Fig. 3.6(b). It is represented by a Greek letter lambda ( and is expressed in terms of m, cm, nm or Angstrom (1Å = 10-10 m). Frequency: It is defined as the number of wave crests or wave troughs that pass through a given point per second.
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