Answer
As an Na atom approaches a Cl atom, the outer electron of the Na atom is transferred to the Cl atom. The result is an Na+ and a Cl- ion. Positively charged ions attract negatively charged ions, so, finally, the NaCl crystal consists of Na+ ions surrounded by six Cl- ions surrounded by six Na+ ions.
Work Step by Step
As an Na atom approaches a Cl atom, the outer electron of the Na atom is transferred to the Cl atom. The result is an Na+ and a Cl- ion. Positively charged ions attract negatively charged ions, so, finally, the NaCl crystal consists of Na+ ions surrounded by six Cl- ions surrounded by six Na+ ions.