If a chlorine atom were to attract an electron from sodium, the sodium atom would become blank charged.

cation (positive charged)

Explanation:

if a chlorine atom were to attract an electron from sodium, the sodium atom would become positive charged.

Sodium chloride is ionic compound. The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion.  The bond formed between them is ionic bond.

Ionic bond:

It is the bond which is formed by the transfer of electron from one atom to the atom of another element.  

Both bonded atoms have very large electronegativity difference. The atom with large electronegativity value accept the electron from other with smaller value of electronegativity.

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