Interactive Periodic Table
Interactive periodic table — click any of the 118 elements for its atomic number, atomic mass, category, electron configuration and oxidation states. Element names in your curriculum's language. Curriculum-aligned.
Interactive Periodic Table
Click any element for its details.
- Curriculum
- English (global) — Cambridge International + IB
- Built against
- Cambridge IGCSE Chemistry 0620 + IB Diploma (2023–2025) — The Periodic Table
- Unit system
- SI primary; US/imperial readout below
- First published
- 2 Jun 2026
- Last updated
- 15 Oct 2026
View authoritative scientific sources
- IUPAC — periodic table of the elements (2021)
- IUPAC — standard atomic weights (CIAAW 2024)
- NIST — atomic & ionization data
- Periodic table — Encyclopædia Britannica
⚠️ Educational use only — see full disclaimer
EDUCATIONAL USE DISCLAIMER
This calculator is provided for educational and reference purposes only. It is not a substitute for instruction from a qualified teacher, your prescribed textbook, or your school's official curriculum materials.
When preparing for examinations, always cross-check our calculations and notation against your current syllabus and your teacher's guidance. Syllabus conventions and accepted notation vary between curricula and may change between examination years.
If you believe any calculation, notation, or curriculum reference in this tool is inaccurate, please let us know via the feedback button. We review feedback promptly and update tools when verified corrections are needed.
RECATOOLS accepts no liability for academic, examination, professional, or research outcomes arising from use of this tool.
How to Use the Periodic Table
Pick your curriculum
Use the curriculum pills above to match your syllabus (Cambridge, SEAB, SPM, SBMPTN, 高考, 學測 or HKDSE). Element names and the whole page follow your selection.
Click an element
Each cell shows the atomic number, symbol and name. Click it to open the detail panel.
Read the details
The panel shows that element's category, atomic mass, group, period, electron configuration and oxidation states.
Use the category colours
Each colour marks a category (alkali metal, halogen, noble gas and so on) as in the legend below the table.
The Periodic Table, in Your Curriculum's Words
The periodic table arranges the 118 known elements by increasing atomic number and recurring chemical properties. Elements in the same group (column) have the same number of valence electrons, so they behave similarly; elements in the same period (row) have the same number of electron shells. This interactive table shows each element's name in the language of the curriculum you select, while the symbols stay the international standard.
Click any element to see its IUPAC standard atomic mass, its category (alkali metal, halogen, noble gas and so on), its electron configuration and its common oxidation states. Element symbols are international standards, but names differ by language — which is why this table localises every name. All data stays in your browser; nothing is uploaded.
Mendeleev laid out his periodic table in 1869 and left blank cells for undiscovered elements — then predicted their properties accurately.
Carbon forms more compounds than every other element combined
The periodic table arranges 118 elements by atomic number.
Mendeleev published the influential version in 1869.
Columns are called groups; rows are called periods.
Elements in a group share the same number of valence electrons.
Hydrogen is the lightest and most abundant element in the universe.
About 94 elements occur naturally on Earth.
Noble gases (group 18) rarely react thanks to full electron shells.
Carbon forms more compounds than all other elements combined.
Element symbols are an international standard; names differ by language.
This table runs in your browser — no data is uploaded.
Frequently Asked Questions
- A group is a vertical column; all elements in a group have the same number of valence electrons and similar chemical properties. A period is a horizontal row; elements in a period have the same number of electron shells. The periodic table has 18 groups and 7 periods.
- Element symbols (H, O, Na, Fe) are an international standard set by IUPAC and are the same worldwide. The names are translated into each language — "Iron" in English is "Ferum" in Malay, "Besi" in Indonesian and 铁 in Chinese. This table switches the names by your chosen curriculum but keeps the standard symbols.
- The detail panel shows that element's atomic number, IUPAC standard atomic mass, category (alkali metal, halogen, noble gas and so on), group, period, electron configuration and common oxidation states.
- These two series (the f-block) really belong in the middle of the table, but placing them there would make it very wide. By convention they are shown as two separate rows beneath the main table.
- Yes. We use IUPAC (CIAAW) standard atomic weights, which are international values. Exam data booklets sometimes round them, so check the value your syllabus prescribes if the last digit matters.
- About 94 elements are found naturally on Earth; the rest are made artificially in reactors or particle accelerators. All 118 have official IUPAC symbols and names.
- An oxidation state is the charge an atom would have if all its bonds were ionic. Many elements have more than one; we list the most common ones for each element.
- The Tool Information block lists the exact syllabus for your selected curriculum (e.g. SEAB O-Level Chemistry 6092 or SPM Kimia 4541). It is a study aid, not a substitute for your official syllabus or teacher.
- Completely free, no account or usage limit. It runs entirely in your browser and collects no data.
Method & sources
How it computes
Reference data, no calculation. Standard atomic weights: CIAAW Abridged Standard Atomic Weights 2024 (for 14 elements the standard weight is an interval; the abridged value is shown). Elements with no standard atomic weight show a long-lived isotope's mass number in brackets. Ground-state configurations: NIST Atomic Spectra Database; Z 109–118 are labelled as predictions. IUPAC names, symbols and 1–18 group numbering.
What this tool implements
- Atomic weights follow CIAAW's Abridged Standard Atomic Weights 2024; all 84 checked on 2026-10-14 lie within the stated uncertainty. Where IUPAC publishes an interval (hydrogen is [1.00784, 1.00811]), the single figure shown is the abridged value, not a more precise one.
- The 34 elements CIAAW gives no standard atomic weight (Tc, Pm, Po–Ac, Np–Og) show the mass number of a long-lived isotope in brackets with "no standard atomic weight" beside it — never in g/mol, because it is a different kind of quantity.
- Ground-state electron configurations match the NIST Atomic Spectra Database for all 108 elements it lists, including the ones tables often get wrong (Cr, Cu, Nb, Pd, Gd, Pt, Th, Cm, Lr). For Z 109–118 NIST lists none; the configurations shown are theoretical predictions and are labelled so.
- Element names and symbols follow IUPAC, including nihonium, moscovium, tennessine and oganesson (approved 2016). Group numbering is IUPAC 1–18.
- Corrected 2026-10-14: technetium and the other 33 showed a mass number as "98 g/mol"; Z 109–118 configurations were shown as measured; the record said "longest-lived isotope", which the conventional values do not all support; CIAAW 2021 updated to 2024.
Sources
- IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW). Abridged Standard Atomic Weights 2024: https://www.ciaaw.org/abridged-atomic-weights.htm
- IUPAC CIAAW. Standard Atomic Weights: https://www.ciaaw.org/atomic-weights.htm
- Kramida A, Ralchenko Yu, Reader J, NIST ASD Team. NIST Atomic Spectra Database — ground levels and ionization energies of the neutral atoms: https://physics.nist.gov/cgi-bin/ASD/ie.pl
- IUPAC Periodic Table of the Elements: https://iupac.org/what-we-do/periodic-table-of-elements/
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