Which of these elements can become stable by losing 1 electron? Explain

A. Calcium

B. Argon

C. Soduim

D. Nitrogen

E. Oxygen

F. Chlorine

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.