Periodic Table Explorer
An interactive periodic table of all 118 elements.
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Click any element to see its atomic number and mass, category, group, period, block, phase at room temperature and electron configuration. Search by name, symbol or atomic number, or filter to a single category — the table keeps its familiar shape while non-matching elements fade out, so you can see where the answer sits.
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How to Use
Click any element
Select a cell to open its details: atomic number, atomic mass, category, group, period, block, phase at standard conditions and its noble-gas shorthand electron configuration.
Search by name, symbol or number
Type Fe, Iron or 26 — all three find the same element. Matching cells stay highlighted while the rest fade, so you keep your bearings in the table.
Filter by category
Use the coloured chips to show only one family at a time — alkali metals, noble gases, halogens, lanthanides and so on. It is the fastest way to see a family's shape in the table.
Copy the details
Copy an element's key facts as a single line of text to paste into homework, notes or a lab write-up.
Frequently Asked Questions
Why are some atomic masses shown in square brackets?
Brackets mean the element has no stable isotope, so there is no standard atomic weight to quote. The number shown is instead the mass number of its longest-lived isotope. This applies to technetium, promethium and everything from polonium (84) upwards, including all the synthetic superheavy elements.
Why do the lanthanides and actinides sit in separate rows?
They are the f-block. Placing them in line would make the table 32 columns wide, so by convention they are pulled out into two rows below it, and periods 6 and 7 show a gap after group 2. It is purely a layout convention — chemically they belong where the gap is.
What do group, period and block mean?
The period is the row, and equals the number of occupied electron shells. The group is the column (1–18); elements in a group share their outer-shell electron count, which is why they behave alike. The block (s, p, d or f) says which type of orbital the outermost electrons occupy.
Which elements are liquid at room temperature?
Only two: bromine and mercury. Caesium, gallium, rubidium and francium melt just above room temperature (gallium melts in your hand at about 30 °C), but at the standard 25 °C they are solid. The phase shown here is the one at standard temperature and pressure.