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# Periodic Table of the Elements ## Key * **Atomic Number:** The number of protons in the atom's nucleus. * **Symbol:** The one or two letter abbreviation for the element. * **Name:** The common name of the element. * **Atomic Weight:** The average mass of an atom of the element. * **Electrons per...

# Periodic Table of the Elements ## Key * **Atomic Number:** The number of protons in the atom's nucleus. * **Symbol:** The one or two letter abbreviation for the element. * **Name:** The common name of the element. * **Atomic Weight:** The average mass of an atom of the element. * **Electrons per shell:** The number of electrons in each electron shell. ## Table | Group | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---| | Period | IA | IIA | IIIB | IVB | VB | VIB | VIIB | VIIIB | VIIIB | VIIIB | IB | IIB | IIIA | IVA | VA | VIA | VIIA | VIIIA | | 1 | H | | | | | | | | | | | | | | | | He | | 2 | Li | Be | | | | | | | | | | | B | C | N | O | F | Ne | | 3 | Na | Mg | | | | | | | | | | | Al | Si | P | S | Cl | Ar | | 4 | K | Ca | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn | Ga | Ge | As | Se | Br | Kr | | 5 | Rb | Sr | Y | Zr | Nb | Mo | Tc | Ru | Rh | Pd | Ag | Cd | In | Sn | Sb | Te | I | Xe | | 6 | Cs | Ba | La-Lu | Hf | Ta | W | Re | Os | Ir | Pt | Au | Hg | Tl | Pb | Bi | Po | At | Rn | | 7 | Fr | Ra | Ac-Lr | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og | ## Lanthanides | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---| | La | Ce | Pr | Nd | Pm | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | ## Actinides | 89 | 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 | 101 | 102 | 103 | |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---| | Ac | Th | Pa | U | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No | Lr |