Explore all 118 elements by group, period, block and chemical family
The periodic table arranges all 118 known elements by atomic number (the number of protons) and by recurring electron-configuration patterns. Columns indicate groups, which gather elements with similar chemical properties; rows indicate periods, tied to the main electron energy level; and the s, p, d and f blocks show the dominant orbital region. This interactive version focuses on fast lookup: you can search an element by symbol, name, atomic number or approximate mass, filter by one of ten chemical families, and open a panel with the reference atomic weight, group, period, block and classification. The lanthanides and actinides appear in separate rows, as in the classic 18-column table. Everything runs in the browser, without sending your searches to a server, and the atomic weights follow IUPAC/CIAAW reference values, including intervals for elements whose natural isotopic composition varies.
Elements are ordered by increasing atomic number, from 1 (hydrogen) to 118 (oganesson). Each position combines a column (group) and a row (period): the group usually signals similar chemical behavior, all noble gases sit in group 18, all alkali metals in group 1, while the period reflects how many energy levels the atom uses. It's this arrangement that turns a list of symbols into a map of predictable patterns.
The s, p, d and f blocks indicate which type of orbital receives the element's differentiating electron, which explains why whole regions of the table share reactivity and oxidation states. The lanthanides and actinides belong to the f block and are set apart below the main body only to keep the table compact in 18 columns; chemically, they are part of periods 6 and 7, near group 3.
Example 1, finding iron: type "26", "Fe" or "iron" in the search. The panel shows iron (Fe), atomic number 26, group 8, period 4, block d, classified as a transition metal, with a reference atomic weight of 55.845. That gathers, in one screen, what is usually scattered across several sources.
Example 2, comparing period 1: hydrogen and helium share the same row but opposite ends. Hydrogen (group 1, reactive nonmetal, s block) has an atomic weight given as the interval [1.00784, 1.00811], while helium (group 18, noble gas, s block) is 4.002602. The comparison shows how a single period can span from the most reactive element to the most inert.
It's useful for studying chemistry in high school and college, reviewing before exams, quickly checking an element's atomic number, group, period and family, or just exploring the table's structure out of curiosity. Searching by approximate mass helps when you remember the value but not the element's name.
On the limits: the atomic weights are reference values for lookup and study, and appear as an interval when the natural isotopic composition varies measurably. For precise laboratory, industrial or academic work, always use the latest IUPAC/CIAAW table and consider the material's isotopic conditions. Superheavy elements may carry a prediction-based classification, with fewer experimental data than stable ones.
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<iframe
src="https://jkit.tools/embed/en-US/periodic-table"
width="100%"
height="600"
style="border:0"
loading="lazy"
title="Periodic Table"
></iframe>These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.
Atomic number is the number of protons in an atom's nucleus, and it's what defines the element's identity. Every atom with 6 protons is carbon, with 8 protons is oxygen, with 26 protons is iron, and so on. That's why the table is ordered by this number, from 1 (hydrogen) to 118 (oganesson).
The table runs locally in your browser and does not send searches to a server.