Osmium is a transition element. Which row shows the properties expected for osmium?
- Amelting point: high; density at r.t.p.: high; compounds formed: coloured
- Bmelting point: high; density at r.t.p.: high; compounds formed: white
- Cmelting point: high; density at r.t.p.: low; compounds formed: white
- Dmelting point: low; density at r.t.p.: high; compounds formed: coloured