Coz brass is an alloy . it contains some other metals too which makes it stronger
Because brass is an alloy of copper and zinc Brass is a mixture of molten copper and zinc that solidifies into a solid solution. Like most pure metals, once it has been molten and mixed with another element or elements, once it solidifies the result is harder because of the the way the atoms arranged. Note that brass is not a compound. If it was a compound, the zinc and copper atoms would have bonded to each other. When something has an ordered atomic structure, that is a mineral.
Brass is stronger than copper because copper is alloy formed with molten coppper and zinc.Hence brass is more stronger than copper
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