A piece of iron is heated to 155 degrees celsius and placed into a calorimeter that contains 50.0 mL of water at 18.7 degrees celsius. The temperature of the water rises to 26.4 degrees celsius. How much heat was released by the iron?

a polar bond is formed when electrons are shared unevenly between atoms

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.