Group VII elements display patterns in their physical properties as you move down the group. The table gives data for chlorine, bromine and iodine. Which row gives the missing headings for the properties in the table?
- AX: density in $\text{g cm}^{-3}$; Y: boiling point in $^\circ\text{C}$; Z: melting point in $^\circ\text{C}$
- BX: melting point in $^\circ\text{C}$; Y: boiling point in $^\circ\text{C}$; Z: density in $\text{g cm}^{-3}$
- CX: boiling point in $^\circ\text{C}$; Y: density in $\text{g cm}^{-3}$; Z: melting point in $^\circ\text{C}$
- DX: boiling point in $^\circ\text{C}$; Y: melting point in $^\circ\text{C}$; Z: density in $\text{g cm}^{-3}$