<P> This period contains technetium, one of the two elements until lead that has no stable isotopes (along with promethium), as well as molybdenum and iodine, two of the heaviest elements with a known biological role, and Niobium has the largest magnetic known penetration depth of all the elements . Zirconium is one of the main components of zircon crystals, currently the oldest known minerals in the earth's crust . Many later transition metals, such as rhodium, are very commonly used in jewelry due to the fact that they are incredibly shiny . </P> <P> This period is known to have a large number of exceptions to the Madelung rule . </P> <Dl> <Dd> <Table> <Tr> <Th_colspan="3"> Chemical element </Th> <Th> Chemical series </Th> <Th> Electron configuration </Th> </Tr> <Tr> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> </Tr> <Tr> <Td> 37 </Td> <Td> Rb </Td> <Td> Rubidium </Td> <Td> Alkali metal </Td> <Td> (Kr) 5s </Td> </Tr> <Tr> <Td> 38 </Td> <Td> Sr </Td> <Td> Strontium </Td> <Td> Alkaline earth metal </Td> <Td> (Kr) 5s </Td> </Tr> <Tr> <Td> 39 </Td> <Td> Y </Td> <Td> Yttrium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s </Td> </Tr> <Tr> <Td> 40 </Td> <Td> Zr </Td> <Td> Zirconium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s </Td> </Tr> <Tr> <Td> 41 </Td> <Td> Nb </Td> <Td> Niobium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s (*) </Td> </Tr> <Tr> <Td> 42 </Td> <Td> Mo </Td> <Td> Molybdenum </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s (*) </Td> </Tr> <Tr> <Td> 43 </Td> <Td> Tc </Td> <Td> Technetium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s </Td> </Tr> <Tr> <Td> 44 </Td> <Td> Ru </Td> <Td> Ruthenium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s (*) </Td> </Tr> <Tr> <Td> 45 </Td> <Td> Rh </Td> <Td> Rhodium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s (*) </Td> </Tr> <Tr> <Td> 46 </Td> <Td> Pd </Td> <Td> Palladium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d (*) </Td> </Tr> <Tr> <Td> 47 </Td> <Td> Ag </Td> <Td> Silver </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s (*) </Td> </Tr> <Tr> <Td> 48 </Td> <Td> Cd </Td> <Td> Cadmium </Td> <Td> Post-transition metal </Td> <Td> (Kr) 4d 5s </Td> </Tr> <Tr> <Td> 49 </Td> <Td> In </Td> <Td> Indium </Td> <Td> Post-transition metal </Td> <Td> (Kr) 4d 5s 5p </Td> </Tr> <Tr> <Td> 50 </Td> <Td> Sn </Td> <Td> Tin </Td> <Td> Post-transition metal </Td> <Td> (Kr) 4d 5s 5p </Td> </Tr> <Tr> <Td> 51 </Td> <Td> Sb </Td> <Td> Antimony </Td> <Td> Metalloid </Td> <Td> (Kr) 4d 5s 5p </Td> </Tr> <Tr> <Td> 52 </Td> <Td> Te </Td> <Td> Tellurium </Td> <Td> Metalloid </Td> <Td> (Kr) 4d 5s 5p </Td> </Tr> <Tr> <Td> 53 </Td> <Td> </Td> <Td> Iodine </Td> <Td> Reactive nonmetal </Td> <Td> (Kr) 4d 5s 5p </Td> </Tr> <Tr> <Td> 54 </Td> <Td> Xe </Td> <Td> Xenon </Td> <Td> Noble gas </Td> <Td> (Kr) 4d 5s 5p </Td> </Tr> </Table> </Dd> </Dl> <Dd> <Table> <Tr> <Th_colspan="3"> Chemical element </Th> <Th> Chemical series </Th> <Th> Electron configuration </Th> </Tr> <Tr> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> </Tr> <Tr> <Td> 37 </Td> <Td> Rb </Td> <Td> Rubidium </Td> <Td> Alkali metal </Td> <Td> (Kr) 5s </Td> </Tr> <Tr> <Td> 38 </Td> <Td> Sr </Td> <Td> Strontium </Td> <Td> Alkaline earth metal </Td> <Td> (Kr) 5s </Td> </Tr> <Tr> <Td> 39 </Td> <Td> Y </Td> <Td> Yttrium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s </Td> </Tr> <Tr> <Td> 40 </Td> <Td> Zr </Td> <Td> Zirconium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s </Td> </Tr> <Tr> <Td> 41 </Td> <Td> Nb </Td> <Td> Niobium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s (*) </Td> </Tr> <Tr> <Td> 42 </Td> <Td> Mo </Td> <Td> Molybdenum </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s (*) </Td> </Tr> <Tr> <Td> 43 </Td> <Td> Tc </Td> <Td> Technetium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s </Td> </Tr> <Tr> <Td> 44 </Td> <Td> Ru </Td> <Td> Ruthenium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s (*) </Td> </Tr> <Tr> <Td> 45 </Td> <Td> Rh </Td> <Td> Rhodium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s (*) </Td> </Tr> <Tr> <Td> 46 </Td> <Td> Pd </Td> <Td> Palladium </Td> <Td> Transition metal </Td> <Td> (Kr) 4d (*) </Td> </Tr> <Tr> <Td> 47 </Td> <Td> Ag </Td> <Td> Silver </Td> <Td> Transition metal </Td> <Td> (Kr) 4d 5s (*) </Td> </Tr> <Tr> <Td> 48 </Td> <Td> Cd </Td> <Td> Cadmium </Td> <Td> Post-transition metal </Td> <Td> (Kr) 4d 5s </Td> </Tr> <Tr> <Td> 49 </Td> <Td> In </Td> <Td> Indium </Td> <Td> Post-transition metal </Td> <Td> (Kr) 4d 5s 5p </Td> </Tr> <Tr> <Td> 50 </Td> <Td> Sn </Td> <Td> Tin </Td> <Td> Post-transition metal </Td> <Td> (Kr) 4d 5s 5p </Td> </Tr> <Tr> <Td> 51 </Td> <Td> Sb </Td> <Td> Antimony </Td> <Td> Metalloid </Td> <Td> (Kr) 4d 5s 5p </Td> </Tr> <Tr> <Td> 52 </Td> <Td> Te </Td> <Td> Tellurium </Td> <Td> Metalloid </Td> <Td> (Kr) 4d 5s 5p </Td> </Tr> <Tr> <Td> 53 </Td> <Td> </Td> <Td> Iodine </Td> <Td> Reactive nonmetal </Td> <Td> (Kr) 4d 5s 5p </Td> </Tr> <Tr> <Td> 54 </Td> <Td> Xe </Td> <Td> Xenon </Td> <Td> Noble gas </Td> <Td> (Kr) 4d 5s 5p </Td> </Tr> </Table> </Dd>

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