What are the 3 most valuable metals in the United States? A. Lead b. Gold c. Iron d. Copper e. Coal f. Silver g. Titanium

Gold, Silver and Titanium

Explanation:

The most valuable metals in the list are:

Gold:

Its value makes it a good investment option. Gold can be used in many different ways, like in jewelry, electronics, medicine, etc.

Silver:

Similar to the case of gold, besides the common value of silver in jewelry, it can be also used in other ways, because it has a large thermal and electrical conductivity.

Finally, the titanium: It's price is actually close to the copper one, but for the cost of work with titanium (Titanium has a really large melting point, then melting it into ingots needs a lot of energy), the price of titanium is increased.

the answer your looking for is c).

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.