Chemical elements listed by atomic number
Find the names and symbols of all 118 recognised chemical elements, arranged by atomic number from hydrogen (1) to oganesson (118).
The atomic number, written Z, is the number of protons in an atom's nucleus. It identifies the element: every carbon atom has six protons, and every oxygen atom has eight.
Elements in atomic-number order
Read down the left-hand table from 1 to 59, then continue at the top of the right-hand table from 60 to 118. The columns stack on smaller screens. Select an element name to open its individual page.
1–59
| Z | Element | Symbol |
|---|---|---|
| 1 | Hydrogen | H |
| 2 | Helium | He |
| 3 | Lithium | Li |
| 4 | Beryllium | Be |
| 5 | Boron | B |
| 6 | Carbon | C |
| 7 | Nitrogen | N |
| 8 | Oxygen | O |
| 9 | Fluorine | F |
| 10 | Neon | Ne |
| 11 | Sodium | Na |
| 12 | Magnesium | Mg |
| 13 | Aluminium | Al |
| 14 | Silicon | Si |
| 15 | Phosphorus | P |
| 16 | Sulfur | S |
| 17 | Chlorine | Cl |
| 18 | Argon | Ar |
| 19 | Potassium | K |
| 20 | Calcium | Ca |
| 21 | Scandium | Sc |
| 22 | Titanium | Ti |
| 23 | Vanadium | V |
| 24 | Chromium | Cr |
| 25 | Manganese | Mn |
| 26 | Iron | Fe |
| 27 | Cobalt | Co |
| 28 | Nickel | Ni |
| 29 | Copper | Cu |
| 30 | Zinc | Zn |
| 31 | Gallium | Ga |
| 32 | Germanium | Ge |
| 33 | Arsenic | As |
| 34 | Selenium | Se |
| 35 | Bromine | Br |
| 36 | Krypton | Kr |
| 37 | Rubidium | Rb |
| 38 | Strontium | Sr |
| 39 | Yttrium | Y |
| 40 | Zirconium | Zr |
| 41 | Niobium | Nb |
| 42 | Molybdenum | Mo |
| 43 | Technetium | Tc |
| 44 | Ruthenium | Ru |
| 45 | Rhodium | Rh |
| 46 | Palladium | Pd |
| 47 | Silver | Ag |
| 48 | Cadmium | Cd |
| 49 | Indium | In |
| 50 | Tin | Sn |
| 51 | Antimony | Sb |
| 52 | Tellurium | Te |
| 53 | Iodine | I |
| 54 | Xenon | Xe |
| 55 | Caesium | Cs |
| 56 | Barium | Ba |
| 57 | Lanthanum | La |
| 58 | Cerium | Ce |
| 59 | Praseodymium | Pr |
60–118
| Z | Element | Symbol |
|---|---|---|
| 60 | Neodymium | Nd |
| 61 | Promethium | Pm |
| 62 | Samarium | Sm |
| 63 | Europium | Eu |
| 64 | Gadolinium | Gd |
| 65 | Terbium | Tb |
| 66 | Dysprosium | Dy |
| 67 | Holmium | Ho |
| 68 | Erbium | Er |
| 69 | Thulium | Tm |
| 70 | Ytterbium | Yb |
| 71 | Lutetium | Lu |
| 72 | Hafnium | Hf |
| 73 | Tantalum | Ta |
| 74 | Tungsten | W |
| 75 | Rhenium | Re |
| 76 | Osmium | Os |
| 77 | Iridium | Ir |
| 78 | Platinum | Pt |
| 79 | Gold | Au |
| 80 | Mercury | Hg |
| 81 | Thallium | Tl |
| 82 | Lead | Pb |
| 83 | Bismuth | Bi |
| 84 | Polonium | Po |
| 85 | Astatine | At |
| 86 | Radon | Rn |
| 87 | Francium | Fr |
| 88 | Radium | Ra |
| 89 | Actinium | Ac |
| 90 | Thorium | Th |
| 91 | Protactinium | Pa |
| 92 | Uranium | U |
| 93 | Neptunium | Np |
| 94 | Plutonium | Pu |
| 95 | Americium | Am |
| 96 | Curium | Cm |
| 97 | Berkelium | Bk |
| 98 | Californium | Cf |
| 99 | Einsteinium | Es |
| 100 | Fermium | Fm |
| 101 | Mendelevium | Md |
| 102 | Nobelium | No |
| 103 | Lawrencium | Lr |
| 104 | Rutherfordium | Rf |
| 105 | Dubnium | Db |
| 106 | Seaborgium | Sg |
| 107 | Bohrium | Bh |
| 108 | Hassium | Hs |
| 109 | Meitnerium | Mt |
| 110 | Darmstadtium | Ds |
| 111 | Roentgenium | Rg |
| 112 | Copernicium | Cn |
| 113 | Nihonium | Nh |
| 114 | Flerovium | Fl |
| 115 | Moscovium | Mc |
| 116 | Livermorium | Lv |
| 117 | Tennessine | Ts |
| 118 | Oganesson | Og |
Atomic number, mass number and atomic weight
| Term | Meaning | Example |
|---|---|---|
| Atomic number (Z) | Number of protons. It is the same for every atom of an element. | Carbon has Z = 6. |
| Mass number (A) | Total number of protons and neutrons in a particular isotope. | Carbon-12 has A = 12: six protons and six neutrons. |
| Standard atomic weight | A recommended relative atomic mass for an element in normal materials, reflecting isotope masses and abundances. It is not a proton count. | Carbon's atomic weight is approximately 12.01. See the atomic-mass list for values and qualifications. |
What changes when an atom becomes an isotope or an ion?
Isotopes of the same element have the same atomic number but different neutron counts. Carbon-12 and carbon-13 both have six protons.
A neutral atom has as many electrons as protons. Gaining or losing electrons forms an ion without changing its atomic number. For example, sodium and the sodium ion Na+ both have Z = 11; neutral sodium has 11 electrons, while Na+ has 10.
How this list relates to the periodic table
The periodic table also follows increasing atomic number. Its rows (periods) and columns (groups) help show recurring patterns in chemical behaviour. This linear list provides a quick way to look up an element's number, name or symbol.
Element 118 is oganesson (Og). “Ununoctium” and “Uuo” were its temporary name and symbol. IUPAC approved the permanent name and symbol in 2016.
Related element lists and calculator
Names A–Z · Symbols · Atomic mass · Electronegativity · Density · Melting point · Boiling point · Van der Waals radius · Year of discovery · Discoverer surname · Elements in the Earth’s crust · Elements in the human body · Covalent radius · Ionization energy
For a chemical formula, use the molecular-weight calculator to calculate molar mass from its constituent atoms.
Sources
- IUPAC periodic table: element names, symbols and atomic numbers.
- IUPAC Gold Book: atomic number, mass number, isotopes and standard atomic weights.
- IUPAC announcement of the permanent names of elements 113, 115, 117 and 118.