To which element does sodium belong?
- Amelting point $1535\,^\circ\text{C}$; electrical conduction good; density $7.86\,\text{g cm}^{-3}$
- Bmelting point $1083\,^\circ\text{C}$; electrical conduction good; density $8.92\,\text{g cm}^{-3}$
- Cmelting point $113\,^\circ\text{C}$; electrical conduction poor; density $2.07\,\text{g cm}^{-3}$
- Dmelting point $98\,^\circ\text{C}$; electrical conduction good; density $0.97\,\text{g cm}^{-3}$