What is Periodic Table Viewer?

An interactive periodic table that lets you explore all 118 chemical elements. Click any element to view its atomic number, mass, electron configuration, and key properties. Filter by element group or search by name and symbol.

Each cell shows the atomic number, symbol, and standard atomic mass; clicking opens a detail panel with electron configuration, electronegativity, first ionization energy, atomic radius, melting and boiling points, density, and the element's category. The category filter shades the table by group (alkali metals, halogens, noble gases, etc.) so trends across periods become visible at a glance. Switch the colour-by selector to a numeric property and the whole table recolours as a heatmap, so periodic trends like decreasing radius down a group are easy to spot. A compare mode lines up two elements side by side for property checks.

How to use

1. Browse the periodic table and click any element to see its detailed properties
2. Use the category filter to highlight specific groups like noble gases or transition metals
3. Search by element name, symbol, or atomic number to quickly locate what you need

When to use

• Helping a student memorise groups, periods, and category trends for a chemistry exam.
• Looking up an element's electron configuration or atomic mass for a calculation.
• Comparing two elements (e.g. Na vs. K) to discuss reactivity, mass, or shell structure.

Result

Click on Gold (Au) to see its atomic number (79), atomic mass (196.97 u), electron configuration [Xe] 4f14 5d10 6s1, melting point 1064 C, and classification as a transition metal.

FAQ

Whose atomic-mass values does the viewer use?

The masses come from IUPAC's most recent standard atomic weights. For elements with stable isotopes they're weighted averages; for radioactive-only elements like Tc or At, the value shown is the mass number of the most stable isotope.

Why are lanthanides and actinides shown in a separate row at the bottom?

Because they belong inside period 6 and 7 between group 2 and group 3 (f-block elements). Drawing them inline would make the table 32 columns wide and unreadable, so the standard convention pulls them out into their own strip.

What's the difference between transition metals and post-transition metals?

Transition metals (groups 3-12, like Fe or Cu) have partially filled d orbitals and form coloured ions. Post-transition metals (Al, Ga, Sn, Pb, Bi) sit to the right of the d-block, are softer, and behave more like main-group metals.

How do I find element 117 quickly?

Type 117 or Ts into the search box at the top, the table dims everything except tennessine. Or filter by the halogen category and look at period 7. Both approaches highlight the element without scrolling.

Can I see elements grouped by metal vs nonmetal?

Yes. Use the category filter and pick a single class such as nonmetals, metalloids, or noble gases. The matching elements stay coloured, everything else dims so the boundary between the metal and nonmetal regions becomes obvious.

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