The statement that correct are a, c and d, which are saying, "Ionic bonds are generally formed when a metal bonds with a non-metal"; "Na+ and Cl- share electrons to form a stable compound. and Na loses an electron to form the cation Na'.
The chemical bond that is formed when the complete sharing of electrons take place, is called a Ionic bond.
Generally, metals loses and electron and non-metals tend to gain an electron. This is why Ionic bonds are usually formed between metals and non-metals.
The ionic bonds are formed when sharing of electron takes place not only by the attraction.
Na⁺ and Cl⁻ shares electrons to form bonds, this statement is true.
Also, the statement saying that Na⁺ cation is formed by the losing of one electron by Sodium. It is true.
Because sodium is a metal, it loses an electron and chlorine is a non-metal, it gains an electron so that they both can form a bond between the, share there electrons and form a stable compound.
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