All 118 elements with IUPAC atomic weights, groups, electron configurations and states. Search, filter by category and print it as a PDF.
The periodic table arranges the 118 known chemical elements by atomic number into 18 groups (columns) and 7 periods (rows), so that elements in the same column behave alike. The atomic number is the number of protons in the nucleus, and it never repeats: hydrogen is 1, carbon is 6, iron is 26 and oganesson is 118. Each period starts a new electron shell, which is why the rows get longer: 2 elements in period 1, 8 in periods 2 and 3, 18 in periods 4 and 5, and 32 in periods 6 and 7. Tap any element for its card, which gives the symbol, name, number, atomic weight, group, period, block, electron configuration and state at room temperature.
Atomic weights are the IUPAC abridged standard atomic weights published by its Commission on Isotopic Abundances and Atomic Weights (CIAAW). The card shows the value with its uncertainty, for example iron 55.845 ± 0.002 and carbon 12.011 ± 0.002. A few elements have no single value because their natural isotope mix varies between samples. For hydrogen, lithium, boron, carbon, nitrogen, oxygen, magnesium, silicon, sulfur, chlorine, argon, bromine, thallium and lead, IUPAC gives an interval and a conventional value for everyday use, and this table shows the conventional one. Elements with no stable isotopes, such as technetium and the elements after bismuth except thorium, protactinium and uranium, have no standard atomic weight. For those the table shows the mass number of the longest-lived known isotope in square brackets, such as [97] for technetium.
A group is a column and a period is a row. The s block is groups 1 and 2 plus helium, the p block is groups 13 to 18, the d block is groups 3 to 12, and the f block is the two rows of 14 elements shown below the main table: lanthanum to ytterbium and actinium to nobelium. IUPAC has not settled which elements belong in group 3 and recommends no single table form, so the layout here is this tool's own choice: scandium, yttrium, lutetium and lawrencium in group 3, which keeps the f block at two rows of 14. Categories are the colour groups: alkali metals, alkaline earth metals, transition metals, post-transition metals, metalloids, nonmetals, halogens, noble gases, lanthanides and actinides. Categories are a teaching convention rather than an IUPAC standard, so books differ on a few elements, for example astatine and polonium. Every category also has a text label, so the table does not depend on colour. For the heaviest elements the category is the one their position predicts, because most of their chemistry has never been measured.
The electron configuration lists how the electrons fill the shells, with a noble gas in brackets standing for the filled inner shells. Chromium is [Ar] 3d5 4s1 and copper is [Ar] 3d10 4s1, not the 4s2 pattern the simple filling order suggests. Configurations for elements 1 to 108 come from the NIST Atomic Spectra Database, which derives ground configurations by calculation from spectra. Elements 109 to 118 are not in that database, so their configurations are predictions, and the card says so. State is given at 20 °C and one atmosphere: 11 elements are gases, bromine and mercury are liquids, most others are solids, and for elements such as francium, astatine and everything from fermium on the state is shown as not known because no sample has been observed.
Type a name, a symbol or an atomic number in the search box. Aluminum, cesium and sulphur also work. Elements that do not match are dimmed rather than removed, so the table keeps its shape, and the count under the controls says how many match. On a phone the table scrolls sideways inside its own box; the list view shows the same elements as rows. The PDF is a single landscape page on A4 or US Letter with number, symbol, name and weight in every cell and a colour legend. This page shows no melting points, electronegativities or isotopes, and it does not replace the full IUPAC tables for work that needs more digits.
118, numbered 1 (hydrogen) to 118 (oganesson). The newest four, nihonium (113), moscovium (115), tennessine (117) and oganesson (118), were named in 2016.
12.011 ± 0.002. IUPAC gives carbon as an interval from 12.0096 to 12.0116 because the mix of carbon-12 and carbon-13 varies between natural samples, and 12.011 is the conventional value for everyday work.
Those elements have no stable isotope and so no standard atomic weight. The bracket holds the mass number of the longest-lived known isotope, for example [97] for technetium, [209] for polonium and [294] for oganesson.
Bromine and mercury, at 20 °C and one atmosphere. Caesium and gallium melt at about 28 °C and 30 °C, so they are solid at 20 °C but liquid on a warm day. Eleven elements are gases, from hydrogen and helium to radon.
It is this tool's chosen convention, not an IUPAC ruling: IUPAC has not decided whether group 3 holds scandium, yttrium, lutetium and lawrencium or scandium, yttrium, lanthanum and actinium, and it recommends no single table form. The choice here keeps both f-block rows at 14 elements and the main table at 18 columns. Check which one your class uses.
Yes. Choose A4 or Letter and download the PDF: one landscape page with all 118 elements, each cell showing number, symbol, name and weight, plus a colour legend. Print at Actual size. The PDF is made in your browser and nothing is uploaded.