Iron (fe) has mixed atomic bonding. 55% metallic and 45% covalent. as it is heated it becomes more metallic and more covenant when cooled. based on this information explain the following. as iron is a) what happens to its ductility initially b) what happens to its conductivity initially? c) what happens to its toughness initially? d) as iron is heated red hot, the crystal structure changer from _cc to _cc g) does it contract or expand?