<Tr> <Td> multiple / many / variable </Td> <Td> polyvalent </Td> <Td> multivalent </Td> </Tr> <Tr> <Td> together </Td> <Td> covalent </Td> <Td>--</Td> </Tr> <Tr> <Td> not together </Td> <Td> noncovalent </Td> <Td>--</Td> </Tr> <P> † The same adjectives are also used in medicine to refer to vaccine valence, with the slight difference that in the latter sense, quadri - is more common than tetra - . </P>

How is the valency of an element in a covalent compound measured