In a covalent bond between two atoms A and B, the valence electrons of one atom behave as the electrons of the other atom. As a result, the electron number of atom A increases. If the atomic number of A is x, the proton number of A is also x, and the electron number is x + something, indicating that the number of electrons is more than the number of protons. Therefore, atom A develops a negative charge. Similarly, atom B also develops a negative charge. However, we know that no charge is formed in a covalent bond. So, where is my misconception?