Answer: 1) oxygen (O), sulfur (S), and selenium (Se)—are nonmetals. Iron is metal
2) Most elements are solid at room temperature but there are 2 elements that are liquid and 11 elements that are gases at 298 K. Hydrogen (H), Helium (He), Nitrogen (N), Oxygen (O), Fluorine (F), Neon (Ne), Chlorine (Cl), Argon (Ar), Krypton (Kr), Xenon (Xe) and Radon (Rn) are all gases at room temperature.
3) iron is a good conductor of energy
4) iron is soft, malleable, and ductile, and is strongly magnetic
5)
Image result for oxygen or iron does it have a luster
Iron is a lustrous, ductile, malleable, silver-gray metal (group VIII of the periodic table). It is known to exist in four distinct crystalline forms. Iron rusts in damp air, but not in dry air. ... Iron is the most used of all the metals, including 95 % of all the metal tonnage produced worldwide.
Explanation: hope this helps you pls brainliest :)
