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Carbon is a Group 14 element and is distributed very widely in nature. It is found in abundance in the sun, stars, comets, and atmospheres of most planets. Carbon is present as carbon dioxide in the atmosphere and dissolved in all natural waters. It is a component of rocks as carbonates of calcium (limestone), magnesium, and iron. The atmosphere of Mars is very thin but what there is contains about 95 % CO 2. Coal, petroleum, and natural gas are chiefly hydrocarbons.
Now, when copper is combined with other metals the end result is an alloy. Both bronze and brass are examples of copper alloys. They too play very important roles industrially. The primary difference between the two is that brass is made out of copperâs combination with zinc while bronze is literally copper plus tin. As mentioned, copper is now popularly used in many industries but for it to become more useful, it needs to be combined first with other more stable metals. This is because copper in its purest form is just too soft. This is the same reason why bronze and brass came to existence. Historically speaking, bronze is an older alloy because it is said that it was already discovered as early as 3500 BC.