QiLing Tools

⚛️Interactive Periodic Table - Atomic Mass, Electronegativity

This is a clickable periodic table in the standard 18-column layout, with the lanthanides and actinides in their own rows below. By default the elements are coloured by category (alkali metals, alkaline earth metals, transition metals, post-transition metals, metalloids, reactive nonmetals, halogens, noble gases, lanthanides and actinides). You can switch to s, p, d and f blocks or the phase at standard conditions, or turn Pauling electronegativity, atomic mass, melting point or boiling point into a heat map to see the periodic trends at a glance — electronegativity rising towards the top right, melting points peaking around carbon and tungsten. Click any element to see its English and Chinese names, atomic number, IUPAC standard atomic weight, group, period, block, electronegativity, electron configuration (such as [Ar] 3d⁶ 4s², including the exceptions like Cr and Cu), common oxidation states, phase and melting and boiling points in kelvin and Celsius. Search by symbol, name or atomic number; on a phone the table scrolls sideways.

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How to use Interactive Periodic Table

  1. 1Choose what to colour by: category, block, electronegativity, atomic mass, phase, melting or boiling point
  2. 2Type a symbol, name or atomic number into the search box to dim the elements that don’t match
  3. 3Click any element for its atomic weight, electron configuration, oxidation states and melting and boiling points

FAQ

How is the periodic table arranged?
Elements are ordered by atomic number, the number of protons. Each row is a period — there are seven, and the period number equals the number of electron shells. Each column is a group — there are 18 — and elements in a group have similar outer electron configurations and chemistry. The lanthanides (57–71) and actinides (89–103) sit in two rows below the main table so it doesn’t get too wide.
What are the s, p, d and f blocks?
Blocks are named after the subshell that receives the last electron: groups 1 and 2 (plus helium) form the s-block, groups 13–18 the p-block, the transition metals in groups 3–12 the d-block, and the lanthanides and actinides the f-block. Switch the colouring to Block to see the four regions.
What is the trend in electronegativity?
Electronegativity measures how strongly an atom attracts electrons in a bond; this table uses the Pauling scale. It increases from left to right across a period and decreases down a group, so fluorine is highest (3.98) and caesium and francium are lowest (about 0.7–0.8). Helium, neon and argon have no accepted Pauling value and are shown as unknown.
Why are some atomic masses in square brackets?
Technetium, promethium and most elements from polonium onwards have no stable isotopes and no fixed natural isotopic composition, so they have no standard atomic weight. By convention the mass number of the longest-lived isotope is given in brackets instead — technetium [98], plutonium [244] and so on.