<Tr> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Cerium 58 Ce </Td> <Td> Praseodymium 59 Pr </Td> <Td> Neodymium 60 Nd </Td> <Td> Promethium 61 Pm </Td> <Td> Samarium 62 Sm </Td> <Td> Europium 63 Eu </Td> <Td> Gadolinium 64 Gd </Td> <Td> Terbium 65 Tb </Td> <Td> Dysprosium 66 Dy </Td> <Td> Holmium 67 Ho </Td> <Td> Erbium 68 Er </Td> <Td> Thulium 69 Tm </Td> <Td> Ytterbium 70 Yb </Td> <Td> Lutetium 71 Lu </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Thorium 90 Th </Td> <Td> Protactinium 91 Pa </Td> <Td> Uranium 92 U </Td> <Td> Neptunium 93 Np </Td> <Td> Plutonium 94 Pu </Td> <Td> Americium 95 Am </Td> <Td> Curium 96 Cm </Td> <Td> Berkelium 97 Bk </Td> <Td> Californium 98 Cf </Td> <Td> Einsteinium 99 Es </Td> <Td> Fermium 100 Fm </Td> <Td> Mendelevium 101 Md </Td> <Td> Nobelium 102 No </Td> <Td> Lawrencium 103 Lr </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="20"> <P> </P> <Table> <Tr> <Td> <Table> <Tr> <Td> black = solid </Td> <Td> green = liquid </Td> <Td> red = gas </Td> <Td> gray = unknown </Td> <Td> Color of the atomic number shows state of matter (at 0 ° C and 1 atm) </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td> <Table> <Tr> <Td> Primordial </Td> <Td> </Td> <Td> From decay </Td> <Td> </Td> <Td> Synthetic </Td> <Td> Border shows natural occurrence of the element </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td> <Table> <Tr> <Td_colspan="11"> Background color shows subcategory in the metal--metalloid--nonmetal trend: </Td> </Tr> <Tr> <Td_colspan="6"> Metal </Td> <Td> Metalloid </Td> <Td_colspan="3"> Nonmetal </Td> <Td> Unknown chemical properties </Td> </Tr> <Tr> <Td> Alkali metal </Td> <Td> Alkaline earth metal </Td> <Td> Lanthanide </Td> <Td> Actinide </Td> <Td> Transition metal </Td> <Td> Post - ​ transition metal </Td> <Td> Polyatomic nonmetal </Td> <Td> Diatomic nonmetal </Td> <Td> Noble gas </Td> </Tr> </Table> </Td> </Tr> </Table> </Td> </Tr> <Table> <Tr> <Td> <Table> <Tr> <Td> black = solid </Td> <Td> green = liquid </Td> <Td> red = gas </Td> <Td> gray = unknown </Td> <Td> Color of the atomic number shows state of matter (at 0 ° C and 1 atm) </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td> <Table> <Tr> <Td> Primordial </Td> <Td> </Td> <Td> From decay </Td> <Td> </Td> <Td> Synthetic </Td> <Td> Border shows natural occurrence of the element </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td> <Table> <Tr> <Td_colspan="11"> Background color shows subcategory in the metal--metalloid--nonmetal trend: </Td> </Tr> <Tr> <Td_colspan="6"> Metal </Td> <Td> Metalloid </Td> <Td_colspan="3"> Nonmetal </Td> <Td> Unknown chemical properties </Td> </Tr> <Tr> <Td> Alkali metal </Td> <Td> Alkaline earth metal </Td> <Td> Lanthanide </Td> <Td> Actinide </Td> <Td> Transition metal </Td> <Td> Post - ​ transition metal </Td> <Td> Polyatomic nonmetal </Td> <Td> Diatomic nonmetal </Td> <Td> Noble gas </Td> </Tr> </Table> </Td> </Tr> </Table>

What do the number on the periodic table mean