Which of these elements is a metal?

hafnium (hf)

radon (rn)

silicon (si)

sulfur (s)

selenium (se)

The correct answer for above statement is:

Hafnium (atomic number 72) is a metal.

Explanation:

Hafnium is a chemical element including symbol Hf and atomic number 72. A bright, silvery gray, tetravalent transition metal, hafnium chemically relates zirconium and is observed in many zirconium minerals.Hafnium is practiced in wires and electrodes. Hafnium is practiced for nuclear reactor charge rods because of its ability to receive neutrons and its good mechanical and corrosion protection qualities.