Which of the following represents an ion?
A A particle that has 12 protons, 11 neutrons, and 12 electrons.
B article that has 9 protons, 9 neutrons, and 10 electrons.
C A particle that has 14 protons, 14 neutrons, and 14 electrons.
D A particle that has 19 protons, 21 neutrons, and 19 electrons.