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What is the covalent bond formation of methane?
Carbon has 4 . To achieve stability, it should follow the i.e. it should have 8 electrons in its valence shell.
Hydrogen has 1 electron in its valence shell and should have 2 electrons in its valence shell to achieve stability.
Thus, C shares each of its electrons with one hydrogen covalently to form CH4 and achieve a stable form.