The diagram below shows the atoms involved in forming table salt.

The Sodium atom is shown as three concentric circles; the center circle has a large dark dot with smaller dots above and below it; the second ring has 8 dots, evenly spaced, aligned with the two in the first ring, and the outer circle has one dot at the northeast position. Below this is the symbol upper N a, with a single electron dot at the northeast position. The Chlorine atom is shown as as three rings, with inner heavy dot with two smaller dots, 8 evenly spaced dots in the middle ring, and seven dots in the outer ring, with the west position not filled. Below that is the symbol upper C l, with to electron dots above, to the left, and to the right, with one electron dot below.

Which statement best describes what happens next?
Sodium becomes an anion by losing an electron to chlorine.
Chlorine becomes a cation by losing an electron to sodium.
Sodium becomes a cation by gaining an electron from chlorine.
Chlorine becomes an anion by gaining an electron from sodium.