A substance which cannot be broken down into a simpler substance is called an element. There are more than 100 elements in nature. Each element has its own specific atomic structure, and its own chemical properties.
The number of protons in an atom is called its atomic number. Elements with similar chemical properties are grouped into families. Amazingly, all elements in a family are related in a regular mathematical relationship-based on their atomic number (number of protons in their atoms).
Alkali Metals | Noble Gasses | Non-Metals | Other Metals | Lanthanide Series | Actinide Series | Transition Metals | Alkaline Earth Metals |
1+ | 2+ | 3+ | 4± | 3- | 2- | 1- | 0 | ||||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ||
H | He | ||||||||||||||||
Li | Be | B | C | N | O | F | Ne | ||||||||||
Na | Mg | Al | Si | P | S | Cl | Ar | ||||||||||
K | Ca | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn | Ga | Ge | As | Se | Br | Kr |
Rb | Sr | Y | Zr | Nb | Mo | Tc | Ru | Rh | Pd | Ag | Cd | In | Sn | Sb | Te | I | Xe |
Cs | Ba | _ | Hf | Ta | W | Re | Os | Ir | Pt | Au | Hg | Tl | Pb | Bi | Po | At | Rn |
Fr | Ra | _ | Rf | Ha | Unh | Ns | Hs | Mt | Uun | Uuu | Uub | ||||||
La | Ce | Pr | Nd | Pm | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | |||
Ac | Th | Pa | U | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No | Lr |