<Tr> <Th> Homogeneity </Th> <Td> Homogeneous </Td> <Td> Visually homogeneous <P> but microscopically heterogeneous </P> </Td> <Td> Heterogeneous </Td> </Tr> <P> but microscopically heterogeneous </P> <Tr> <Th> Particle size </Th> <Td> <1 nm </Td> <Td> 1 nm--1 μm </Td> <Td>> 1 μm </Td> </Tr> <Tr> <Th> Physically stable </Th> <Td> Yes </Td> <Td> Yes </Td> <Td> Needs stabilizing agents </Td> </Tr>

What name is given to a substance made from a mixture of two or more different metals