Which row gives the description of a transition element?
- Adensity $0.98\,\text{g cm}^{-3}$; colour of chloride: green
- Bdensity $0.98\,\text{g cm}^{-3}$; colour of chloride: white
- Cdensity $8.90\,\text{g cm}^{-3}$; colour of chloride: green
- Ddensity $8.90\,\text{g cm}^{-3}$; colour of chloride: white