Which metal was found first?
(a)Bronze
(b)Brass
(c)Iron
(d)Copper

Hint: This chemical element has the symbol Cu and the atomic number 29 (from Latin: cuprum).
-With very high thermal and electrical conductivity, it is a soft, malleable and ductile metal.
-A pinkish-orange colour has a freshly exposed surface of a pure element.
-It is used in electrical products, such as cables and motors. This is because it very well conducts both heat and electricity, and can be drawn through cables.

Complete answer: Option A. Bronze -
Bronze is the definition given to any alloy that is 85-95 percent copper with the remainder consisting of tin or arsenic in reduced quantities with the possibility of other metals being present. The first traces of the use of bronze by the ancient Sumerians began to appear in the Tigris Euphrates valley in Western Asia around 3500 BC. One hypothesis indicates that when copper and tin-rich rocks were used to create campfire rings, bronze may have been discovered. The bronze metal was not found first. Hence, this option is incorrect.
Option B. Brass-
About 500 BC, brass was invented. Brass is manufactured from a copper and zinc alloy. Since zinc is rarely, if ever, found in its natural state, melting copper and calamine (a zinc ore) produced a golden-coloured tarnish-resistant metal discovered early on. The brass metal was not found first. Hence, this option is incorrect.
Option C. Iron-
There is evidence in Mesopotamia (Iraq) that people smelted iron around 5000 BC. In Egypt and Mesopotamia, objects made of smelted iron have been found dating from around 3000 BC. Iron metal is not invented first. Hence, this option is incorrect.
Option D. Copper-
In fact, the first metal that man discovered in 9000 BCE was copper. Gold, silver, tin, lead, and iron were the other metals used in prehistoric times. Over 10,000 years ago, copper was first used by man. The date of a copper pendant found in what is now northern Iraq is around 8700 B.C. Copper had been the only metal known to man for nearly five centuries and therefore had all metal applications. The copper metal was found first. Hence, this option is correct.
Therefore, as we discussed above, copper is the first metal which was discovered. Hence, Option D. Copper is the correct answer.

Note: With other metals, copper readily forms alloys. Brass (copper and zinc) and bronze (copper and tin) are two of the best-known alloys, although hundreds of alloys exist.
Almost 80% of the copper that has been mined so far is still in use. Copper is a metal which is 100 percent recyclable. In the Earth's crust, it is an abundant metal, present at concentrations of 50 parts per million.