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## Step 1: - Sodium (Na) has the chemical symbol Na and is shown with one valence electron. - Chlorine (Cl) has the chemical symbol Cl and is shown with seven valence electrons. ## Step 2: - Sodium gives up its one valence electron and becomes positively charged. - Chlorine gains one valence electr...

## Step 1: - Sodium (Na) has the chemical symbol Na and is shown with one valence electron. - Chlorine (Cl) has the chemical symbol Cl and is shown with seven valence electrons. ## Step 2: - Sodium gives up its one valence electron and becomes positively charged. - Chlorine gains one valence electron and becomes negatively charged. ## Step 3: - Sodium and Chlorine now have a completed outer shell with eight valence electrons. - (a) The new sodium ion (Na+) has one less electron than the original sodium atom. - (b) depicts the crystal lattice, with the ions alternating in a pattern that balances the charges in the compound sodium chloride.