C. Sodium. This is correct because it would then become like the noble gases, which are not reactive because they have 8 valence electrons in their outer shell. Therefore, it will become stable because it would have 8 valence electrons in its outer shell.
Which of these elements can become stable by losing 1 electron? Explain A. Calcium B. Argon C. Soduim D. Nitrogen E. Oxygen F. Chlorine