Chemical bonds are formed when valence electrons are shared or donated.
Chemical bonds
Chemical bonds are formed between two or more atoms when electrons are transferred or shared between or among the participating atoms.
For example, ionic bonds are formed when a metal ion such as Na donates its valence electrons to a non-metallic ion such as Cl to form NaCl.
Covalent bonds are formed when participating ions shared their valence electrons to give each other octet states.
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