(a) Covalency of Hydrogen
The atomic number of hydrogen is 1, so its electronic configuration is 1.A hydrogen atom has 1 electron in its outermost shell, which is K shell, so it needs 1 more electron to achieve the 2-electron inert gas electron arrangement of helium and become stable. Hydrogen atom gets this electron by sharing. Since one atom of hydrogen shares 1 electron to achieve the nearest inert gas electron configuration, therefore,the covalency (or just valency) of hydrogen is 1.For example, in the formation of a hydrogen molecule H2, two hydrogen atoms share 1 electron with each other to achieve the nearest inert gas electron arrangement, so the valency of hydrogen in H2 molecule is 1. Please note that the shared electrons are counted with both the combining atoms for the purpose of determining their inert gas electron configuration.
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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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4. For the symbols H, D and T,tabulate three sub-atomic particles found in each of them.
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9. Structure of The Atom - Study Points
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10. Limitations of Rutherford's model of the atom
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11. Arrangement Of Electrons In The Atoms
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12. All about Names of the Chemical Elements
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17. How to learn naming Chemical Formulae?
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22. Rules for writing of distribution of electrons in various shells for the first 18 elements
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24. Electronic Configurations of First 20 Elements
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25. Comparison between Proton, Neutron and Electron
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33. The Physical Properties of the Isotopes of an Element are Different
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39. All the Isotopes of an Element Have Identical Chemical Properties
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42. Relationship Between Mass Number and Atomic Number
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44. Electronic Configurations of Noble Gases (or Inert Gases)
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50. Applications of Radioactive Isotopes
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