Liquid air is divided into its gaseous components by fractional distillation. The boiling points of four gases are given below. Which gas is monatomic and also remains liquid at $-200\,^{\circ}\text{C}$?
- Aargon, boiling point $-186\,^{\circ}\text{C}$
- Bhelium, boiling point $-269\,^{\circ}\text{C}$
- Cneon, boiling point $-246\,^{\circ}\text{C}$
- Dnitrogen, boiling point $-196\,^{\circ}\text{C}$