What chemical bond is called covalent? What is the mechanism of its formation? How to determine the number

What chemical bond is called covalent? What is the mechanism of its formation? How to determine the number of unpaired electrons at the outer energy level of an atom?

What chemical bond is called covalent? The chemical bond resulting from the formation of common electron pairs is called atomic, or covalent.
What is the mechanism of its formation? Common (shared) electron pairs are formed, which belong to the outer electron layers of neighboring atoms.
How to determine the number of unpaired electrons at the outer energy level of an atom? It is necessary to subtract from the eight the number of external electrons equal to the group number.
What is the electronic formula for the outer energy level of an atom? Conditional display of the number of electrons in the outer energy level of an atom.

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