chemistry - structure of the atom

Class 9 - Chemistry

Structure of the Atom

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Characteristics of an Electron


The two important characteristics of an electron are its mass and charge.These are described below.
1.Mass of an Electron. The mass of an electron is about11840 of the mass of hydrogen atom (which is the atom of lowest mass). Since the mass of a hydrogen atom is 1 u,we can say that the relative mass of an electron is 11840 u.The absolute mass of an electron is, however,9x10-28 gram.The mass of an electron is so small that it is considered to be negligible. This is why the mass of electrons is ignored while calculating the atomic mass of an element.
2.Charge of an Electron. The absolute charge on an electron is 1.6x1019 coulomb of negative charge.Now, 1.6x1019 coulomb has been found to be the smallest negative charge carried by any particle.So,this is taken as the unit of negative charge. This means that an electron has 1 unit of negative charge. In other words,the relative charge of an electron is, -1 (minus one).

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Notes


Structure of the Atom - Notes
1. Drawback of Rutherford’s Model of the Atom
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2. Rutherford’s Experiment - Discovery of Nucleus
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3. Limitations of Rutherford's model of the atom
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4. Thomson's Model Of The Atom
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5. Rules for writing of distribution of electrons in various shells for the first 18 elements
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6. All about Names of the Chemical Elements
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7. (e) Valency of Oxygen
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8. (d) Covalency of Nitrogen
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9. Comparison between Proton, Neutron and Electron
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10. Structure of The Atom - Study Points
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11. 3.Isotopes of Oxygen.
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12. (f) Valency of Nitrogen
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13. 1. Isotopes of Hydrogen.
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14. Characteristics of an Electron
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15. Rutherford's Model Of The Atom
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16. (c) Valency of Aluminium
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17. 2.Isotopes of Carbon.
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18. 4.Isotopes of Neon.
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19. For the symbols H, D and T,tabulate three sub-atomic particles found in each of them.
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20. Electronic Configurations of Noble Gases (or Inert Gases)
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21. (a) Covalency of Hydrogen
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22. Covalency of Oxygen
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23. (d) Valency of Chlorine
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24. 2.Covalency
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25. (a) Valency of Sodium
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26. How to learn naming Chemical Formulae?
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27. Characteristics of a Proton
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28. Atomic Number
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29. (b) Valency of Magnesium
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30. Nucleus
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31. 1. Electrovalency
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32. Discovery of Neutron
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33. Bohr's Model Of The Atom
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34. Arrangement Of Electrons In The Atoms
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35. Relation Between Valency and Valence Electrons
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36. Valaence Electrons (Or Valancy Electrons)
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37. Radioactive Isotopes
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38. Characteristics of a Neutron
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39. Mass Number
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40. Inertness of Noble Gases
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41. Electronic Configurations of First 20 Elements
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42. Isotopes
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43. Discovery Of Electron
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44. Valaency Of Elements
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45. The Physical Properties of the Isotopes of an Element are Different
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46. All the Isotopes of an Element Have Identical Chemical Properties
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47. Charged Particles in Matter
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48. Discovery of Proton
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49. Covalency of Chlorine
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50. Relationship Between Mass Number and Atomic Number
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