<P> There are four orthorhombic Bravais lattices: primitive orthorhombic, base - centered orthorhombic, body - centered orthorhombic, and face - centered orthorhombic . </P> <Table> <Tr> <Th> Bravais lattice </Th> <Th> Primitive orthorhombic </Th> <Th> Base - centered orthorhombic </Th> <Th> Body - centered orthorhombic </Th> <Th> Face - centered orthorhombic </Th> </Tr> <Tr> <Th> Pearson symbol </Th> <Th> oP </Th> <Th> oS </Th> <Th> oI </Th> <Th> oF </Th> </Tr> <Tr> <Th> Standard unit cell </Th> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Right rhombic prism unit cell </Th> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Bravais lattice </Th> <Th> Primitive orthorhombic </Th> <Th> Base - centered orthorhombic </Th> <Th> Body - centered orthorhombic </Th> <Th> Face - centered orthorhombic </Th> </Tr> <Tr> <Th> Pearson symbol </Th> <Th> oP </Th> <Th> oS </Th> <Th> oI </Th> <Th> oF </Th> </Tr>

How many atoms in a orthorhombic unit cell