According to the Periodic Table, iron is the element that has 26 protons. Its atomic number, correspondingly, is 26. This makes iron an element of middling weight, which may be surprising considering its reputation as a metal of great strength.
Iron is actually not that much harder than copper, having a Mohs scale rating of four or five to copper's three. It is vastly more abundant in the Earth's crust than copper. Although iron is more difficult to work than the very pliable element copper, It's higher availability is what made it the metal of favor throughout Eurasia from ancient times through the Middle Ages and into the modern era, reports Essential Humanities. The transition from the copper-based Bronze Age to the Iron Age represented a technological revolution.