what happens when sodium atom loses an electron in its outer energy shell

Question

 what happens when sodium atom loses an electron in its outer energy shell

Answer 1

It reaches the nearest "noble gas" configuration, albeit as the cation Na+. Sodium will let that electron go as soon as it can, which is why it generally forms ionic compounds such as NaCl.

Answer 2

When sodium atom loses an electron from its outer energy shell, it becomes Na⁺ ion.