https://padlet.com/cortesjimenez_j/wuqvuuzkn7sx en-us 2018-02-06 19:56:17 UTC 2018-02-06 20:19:48 UTC hello@padlet.com cortesjimenez_j https://padlet.com/cortesjimenez_j/wuqvuuzkn7sx/wish/228833357 Fe
(55.845)
Iron

]]> 2018-02-06 20:01:10 UTC https://padlet.com/cortesjimenez_j/wuqvuuzkn7sx/wish/228833357 cortesjimenez_j https://padlet.com/cortesjimenez_j/wuqvuuzkn7sx/wish/228836977 Iron is the fourth most abundant element, by mass, in the Earth's crust. The core of the Earth is thought to be largely composed of iron with nickel and sulfur. The most common iron-containing ore is haematite, but iron is found widely distributed in other minerals such as magnetite and taconite. In Mesopotamia (Iraq) there is evidence people were smelting iron around 5000 BC. Artifacts made of smelted iron have been found dating from about 3000 BC in Egypt and Mesopotamia. In those times, iron was a ceremonial metal; it was too expensive to be used in everyday life.

]]> 2018-02-06 20:08:14 UTC https://padlet.com/cortesjimenez_j/wuqvuuzkn7sx/wish/228836977 cortesjimenez_j https://padlet.com/cortesjimenez_j/wuqvuuzkn7sx/wish/228843000 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. It dissolves readily in dilute acids. Iron is chemically active and forms two major series of chemical compounds, the bivalent iron (II), or ferrous, compounds and the trivalent iron (III), or ferric, compounds.

]]> 2018-02-06 20:14:11 UTC https://padlet.com/cortesjimenez_j/wuqvuuzkn7sx/wish/228843000 cortesjimenez_j https://padlet.com/cortesjimenez_j/wuqvuuzkn7sx/wish/228844636 A shiny, greyish metal that rusts in damp air. Iron is an enigma – it rusts easily, yet it is the most important of all metals. 90% of all metal that is refined today is iron. Most is used to manufacture steel, used in civil engineering (reinforced concrete, girders etc) and in manufacturing.

]]> 2018-02-06 20:17:22 UTC https://padlet.com/cortesjimenez_j/wuqvuuzkn7sx/wish/228844636