Interactive Periodic Table
All 118 elements · phase slider · electron shells · quiz mode · trends
Element Comparison
The periodic table is a chart that organises all 118 known chemical elements by increasing atomic number (the number of protons in the nucleus). Elements are arranged into 7 rows (periods) and 18 columns (groups), so that elements with similar chemical properties line up in the same group. This interactive version lets you explore each element's electron configuration, melting and boiling points, and how properties like electronegativity trend across the table.
The full list of elements below runs from Hydrogen (atomic number 1) to Oganesson (atomic number 118), with each element's symbol, name, standard atomic weight, and category. Click any cell in the interactive table above to see full details for that element.
| # | Symbol | Element | Atomic weight | Category |
|---|---|---|---|---|
| 1 | H | Hydrogen | 1.008 | Nonmetal |
| 2 | He | Helium | 4.003 | Noble gas |
| 3 | Li | Lithium | 6.941 | Alkali metal |
| 4 | Be | Beryllium | 9.012 | Alkaline earth |
| 5 | B | Boron | 10.81 | Metalloid |
| 6 | C | Carbon | 12.011 | Nonmetal |
| 7 | N | Nitrogen | 14.007 | Nonmetal |
| 8 | O | Oxygen | 15.999 | Nonmetal |
| 9 | F | Fluorine | 18.998 | Halogen |
| 10 | Ne | Neon | 20.180 | Noble gas |
| 11 | Na | Sodium | 22.990 | Alkali metal |
| 12 | Mg | Magnesium | 24.305 | Alkaline earth |
| 13 | Al | Aluminium | 26.982 | Post-transition metal |
| 14 | Si | Silicon | 28.086 | Metalloid |
| 15 | P | Phosphorus | 30.974 | Nonmetal |
| 16 | S | Sulfur | 32.06 | Nonmetal |
| 17 | Cl | Chlorine | 35.45 | Halogen |
| 18 | Ar | Argon | 39.948 | Noble gas |
| 19 | K | Potassium | 39.098 | Alkali metal |
| 20 | Ca | Calcium | 40.078 | Alkaline earth |
| 21 | Sc | Scandium | 44.956 | Transition metal |
| 22 | Ti | Titanium | 47.867 | Transition metal |
| 23 | V | Vanadium | 50.942 | Transition metal |
| 24 | Cr | Chromium | 51.996 | Transition metal |
| 25 | Mn | Manganese | 54.938 | Transition metal |
| 26 | Fe | Iron | 55.845 | Transition metal |
| 27 | Co | Cobalt | 58.933 | Transition metal |
| 28 | Ni | Nickel | 58.693 | Transition metal |
| 29 | Cu | Copper | 63.546 | Transition metal |
| 30 | Zn | Zinc | 65.38 | Transition metal |
| 31 | Ga | Gallium | 69.723 | Post-transition metal |
| 32 | Ge | Germanium | 72.630 | Metalloid |
| 33 | As | Arsenic | 74.922 | Metalloid |
| 34 | Se | Selenium | 78.971 | Nonmetal |
| 35 | Br | Bromine | 79.904 | Halogen |
| 36 | Kr | Krypton | 83.798 | Noble gas |
| 37 | Rb | Rubidium | 85.468 | Alkali metal |
| 38 | Sr | Strontium | 87.62 | Alkaline earth |
| 39 | Y | Yttrium | 88.906 | Transition metal |
| 40 | Zr | Zirconium | 91.224 | Transition metal |
| 41 | Nb | Niobium | 92.906 | Transition metal |
| 42 | Mo | Molybdenum | 95.95 | Transition metal |
| 43 | Tc | Technetium | 98 | Transition metal |
| 44 | Ru | Ruthenium | 101.07 | Transition metal |
| 45 | Rh | Rhodium | 102.91 | Transition metal |
| 46 | Pd | Palladium | 106.42 | Transition metal |
| 47 | Ag | Silver | 107.87 | Transition metal |
| 48 | Cd | Cadmium | 112.41 | Transition metal |
| 49 | In | Indium | 114.82 | Post-transition metal |
| 50 | Sn | Tin | 118.71 | Post-transition metal |
| 51 | Sb | Antimony | 121.76 | Metalloid |
| 52 | Te | Tellurium | 127.60 | Metalloid |
| 53 | I | Iodine | 126.90 | Halogen |
| 54 | Xe | Xenon | 131.29 | Noble gas |
| 55 | Cs | Caesium | 132.91 | Alkali metal |
| 56 | Ba | Barium | 137.33 | Alkaline earth |
| 57 | La | Lanthanum | 138.91 | Lanthanide |
| 58 | Ce | Cerium | 140.12 | Lanthanide |
| 59 | Pr | Praseodymium | 140.91 | Lanthanide |
| 60 | Nd | Neodymium | 144.24 | Lanthanide |
| 61 | Pm | Promethium | 145 | Lanthanide |
| 62 | Sm | Samarium | 150.36 | Lanthanide |
| 63 | Eu | Europium | 151.96 | Lanthanide |
| 64 | Gd | Gadolinium | 157.25 | Lanthanide |
| 65 | Tb | Terbium | 158.93 | Lanthanide |
| 66 | Dy | Dysprosium | 162.50 | Lanthanide |
| 67 | Ho | Holmium | 164.93 | Lanthanide |
| 68 | Er | Erbium | 167.26 | Lanthanide |
| 69 | Tm | Thulium | 168.93 | Lanthanide |
| 70 | Yb | Ytterbium | 173.05 | Lanthanide |
| 71 | Lu | Lutetium | 174.97 | Lanthanide |
| 72 | Hf | Hafnium | 178.49 | Transition metal |
| 73 | Ta | Tantalum | 180.95 | Transition metal |
| 74 | W | Tungsten | 183.84 | Transition metal |
| 75 | Re | Rhenium | 186.21 | Transition metal |
| 76 | Os | Osmium | 190.23 | Transition metal |
| 77 | Ir | Iridium | 192.22 | Transition metal |
| 78 | Pt | Platinum | 195.08 | Transition metal |
| 79 | Au | Gold | 196.97 | Transition metal |
| 80 | Hg | Mercury | 200.59 | Transition metal |
| 81 | Tl | Thallium | 204.38 | Post-transition metal |
| 82 | Pb | Lead | 207.2 | Post-transition metal |
| 83 | Bi | Bismuth | 208.98 | Post-transition metal |
| 84 | Po | Polonium | 209 | Post-transition metal |
| 85 | At | Astatine | 210 | Halogen |
| 86 | Rn | Radon | 222 | Noble gas |
| 87 | Fr | Francium | 223 | Alkali metal |
| 88 | Ra | Radium | 226 | Alkaline earth |
| 89 | Ac | Actinium | 227 | Actinide |
| 90 | Th | Thorium | 232.04 | Actinide |
| 91 | Pa | Protactinium | 231.04 | Actinide |
| 92 | U | Uranium | 238.03 | Actinide |
| 93 | Np | Neptunium | 237 | Actinide |
| 94 | Pu | Plutonium | 244 | Actinide |
| 95 | Am | Americium | 243 | Actinide |
| 96 | Cm | Curium | 247 | Actinide |
| 97 | Bk | Berkelium | 247 | Actinide |
| 98 | Cf | Californium | 251 | Actinide |
| 99 | Es | Einsteinium | 252 | Actinide |
| 100 | Fm | Fermium | 257 | Actinide |
| 101 | Md | Mendelevium | 258 | Actinide |
| 102 | No | Nobelium | 259 | Actinide |
| 103 | Lr | Lawrencium | 266 | Actinide |
| 104 | Rf | Rutherfordium | 267 | Transition metal |
| 105 | Db | Dubnium | 268 | Transition metal |
| 106 | Sg | Seaborgium | 269 | Transition metal |
| 107 | Bh | Bohrium | 270 | Transition metal |
| 108 | Hs | Hassium | 277 | Transition metal |
| 109 | Mt | Meitnerium | 278 | Transition metal |
| 110 | Ds | Darmstadtium | 281 | Transition metal |
| 111 | Rg | Roentgenium | 282 | Transition metal |
| 112 | Cn | Copernicium | 285 | Transition metal |
| 113 | Nh | Nihonium | 286 | Post-transition metal |
| 114 | Fl | Flerovium | 289 | Post-transition metal |
| 115 | Mc | Moscovium | 290 | Post-transition metal |
| 116 | Lv | Livermorium | 293 | Post-transition metal |
| 117 | Ts | Tennessine | 294 | Halogen |
| 118 | Og | Oganesson | 294 | Noble gas |
Reading left to right, atomic number increases by one with each element. Groups (vertical columns) share the same number of outer-shell electrons and therefore similar behaviour — for example Group 1 is the reactive alkali metals and Group 18 is the inert noble gases. Periods (horizontal rows) correspond to the electron shell being filled. The lanthanides (57–71) and actinides (89–103) are shown as two separate rows below the main table to keep it compact.
The periodic table contains 118 confirmed elements, from Hydrogen (atomic number 1) to Oganesson (atomic number 118). Elements 113-118 were officially named by IUPAC in 2016. Scientists continue to attempt synthesis of elements 119 and beyond.
Elements are grouped into categories based on their chemical and physical properties: alkali metals, alkaline earth metals, transition metals, post-transition metals, metalloids, reactive nonmetals, halogens, noble gases, lanthanides, and actinides. Each category shares similar electron configurations and reactivity patterns.
Most elements — roughly three-quarters of the table — are metals: shiny, malleable, and good conductors of heat and electricity, occupying the left and center of the table. Nonmetals, on the upper right, are typically dull, brittle solids or gases with poor conductivity, including carbon, oxygen, and the halogens. Metalloids — boron, silicon, germanium, arsenic, antimony, tellurium, and polonium — sit along the zig-zag staircase between the two and share properties of both, which is why silicon and germanium are used as semiconductors.
Atomic number (Z) is the number of protons in an atom's nucleus — it defines the element, and changing it turns the atom into a different element entirely. Atomic mass is the weighted average mass of all naturally occurring isotopes of an element, measured in atomic mass units (u), which is why it is almost never a round number.
A group is a vertical column — 18 in total. Elements in the same group share the same number of valence electrons and therefore similar chemical behaviour, from the reactive alkali metals in Group 1 to the inert noble gases in Group 18. A period is a horizontal row — 7 in total. Moving across a period adds one electron to the same outer shell at a time, so properties shift gradually from metallic to nonmetallic left to right.
The four most recent additions — nihonium (113), moscovium (115), tennessine (117), and oganesson (118) — completed the seventh period and were officially named by IUPAC in 2016. All four are synthetic superheavy elements made in particle accelerators; they exist for only a fraction of a second before decaying, so none occurs in nature or has ever been produced in a visible quantity. No element beyond 118 has been confirmed.
Lanthanides (elements 57-71) and actinides (elements 89-103) are placed below the main table by convention to keep the table compact. If inserted in their true positions (period 6 group 3 and period 7 group 3), the table would be 32 columns wide, making it impractical to display.
Electronegativity measures an atom's ability to attract shared electrons in a chemical bond, using the Pauling scale. Fluorine has the highest electronegativity (3.98) while Francium has the lowest (~0.7). Electronegativity generally increases across a period (left to right) and decreases down a group (top to bottom). Noble gases are typically excluded as they rarely form bonds.
Ionization energy is the energy required to remove the most loosely held electron from a gaseous atom. Like electronegativity, it generally increases across a period, as a growing nuclear charge pulls electrons in tighter, and decreases down a group, as outer electrons sit farther away and are shielded by inner shells. Noble gases have the highest ionization energy in their period, since their filled outer shell is especially stable; alkali metals have the lowest.
Atomic radius is a measure of the size of an atom, typically the distance from the nucleus to the outermost electron shell. It increases down a group, since each row adds a new electron shell farther from the nucleus, and decreases across a period, as growing nuclear charge pulls the same-shell electrons in tighter without adding a new one. Francium, bottom-left, has the largest atomic radius on the table; helium, top-right, has the smallest.
Valence electrons are the electrons in an atom's outermost shell, and they are what determine how an element bonds with others. For main-group elements, the group number maps directly onto the valence electron count: Group 1 elements have one valence electron, the halogens in Group 17 have seven, and the noble gases in Group 18 have a full eight — which is why noble gases rarely react at all.
An electron shell diagram shows how electrons are distributed across energy levels (shells) around an atom's nucleus. The first shell holds up to 2 electrons, the second up to 8, the third up to 18, and the fourth up to 32. Click any element to see its electron shell diagram visualized with concentric rings.
The phase slider lets you set any temperature from 0 K to 6000 K. Each element on the table is then color-coded based on whether it is solid (blue), liquid (red), or gas (green) at that temperature, using real melting and boiling point data. Elements with unknown phase data are shown in gray.
This tool visualizes three key trends: electronegativity (tendency to attract electrons), atomic radius (size of atoms), and ionization energy (energy needed to remove an electron). Each trend is shown as a color gradient overlaid on the periodic table, making patterns across periods and groups immediately visible.
Click the Compare tab, then click any two elements on the table. Their properties — including atomic mass, density, melting point, boiling point, electronegativity, electron configuration, and discovery year — are displayed side-by-side for easy comparison.
Three quiz modes test different aspects of your periodic table knowledge: Find by Name (click the correct element on the table), Name from Symbol (type the element name given its symbol), and Identify by Number (type the element name given its atomic number).
Yes. Type into the search box to filter by element name, symbol, or atomic number as you type. Use the category dropdown to highlight every element in a given category — such as noble gases or transition metals — while dimming the rest of the table.
Yes. The layout is fully responsive and touch-friendly, so the table, tabs, and controls resize and stay usable on phones and tablets.
Yes, completely free. No account, no subscription, no ads. It is one of the free browser-based tools at jasperbernaers.com.
Element properties — atomic mass, melting and boiling points, electronegativity, ionization energy, atomic radius, and electron configuration — follow standard reference chemistry values consistent with IUPAC and CODATA-recommended figures. For the newest and heaviest synthetic elements, some physical properties are unmeasured or extrapolated, and the table marks these as unknown rather than guessing.
No. The element data, phase calculations, trend visualizations, and quiz all run entirely in your browser with plain JavaScript — nothing you search for, click, or answer is sent to a server. Like every tool on this site, an anonymous, cookie-free page-view count is collected through Simple Analytics; nothing about how you use the table itself is tracked.
Most online periodic tables, including well-known reference sites, are excellent static references and stop there. This one adds interactive layers on top of the reference data: a live temperature phase slider, color-coded trend gradients, a side-by-side element comparator, and three quiz modes — all in one free tool with no ads, no account, and no signup.