<Tr> <Td> 2 - valent </Td> <Td> divalent </Td> <Td> bivalent </Td> </Tr> <Tr> <Td> 3 - valent </Td> <Td> trivalent </Td> <Td> tervalent </Td> </Tr> <Tr> <Td> 4 - valent </Td> <Td> tetravalent </Td> <Td> quadrivalent </Td> </Tr> <Tr> <Td> 5 - valent </Td> <Td> pentavalent </Td> <Td> quinquevalent / quinquivalent </Td> </Tr>

Define valency and calculate the valency of cl