Question

written in this form, na+ means
an electron has been lost.
sodium is an anion
sodium has extra energy in this state.
a charge of +2.
the atom is stable.

Explanation:

In chemistry, a positive ion (cation) is formed when an atom loses an electron. Na⁺ is a sodium - cation. An anion has a negative charge, and Na⁺ has a + 1 charge, not + 2. Just having a charge doesn't necessarily mean extra energy or stability.

Answer:

A. an electron has been lost.