Chemistry

Structure of the Atom


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).

--- >>>

Notes


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