Which row shows a transition element?
- Adensity $0.98\,\text{g cm}^{-3}$, chloride colour green
- Bdensity $0.98\,\text{g cm}^{-3}$, chloride colour white
- Cdensity $8.90\,\text{g cm}^{-3}$, chloride colour green
- Ddensity $8.90\,\text{g cm}^{-3}$, chloride colour white