Periodic Table Element Explorer
Explore all 118 chemical elements with atomic numbers, molar mass, electron configurations, electronegativity, and standard physical states.
Element Search & Selection
Atomic & Quantum Properties
Physical & Thermodynamic Constants
About this tool
How to use it
- Type an element name, chemical symbol (e.g. Au, Fe, Og), or atomic number into the instant search box.
- Or select an element from the dropdown or click any tile in the interactive element browser.
- Filter by chemical family (such as Alkali Metals, Transition Metals, Halogens, or Noble Gases) to isolate specific categories.
- Inspect the detailed atomic mass, electron configuration, Pauling electronegativity, density, melting/boiling points, and discovery history.
Why it matters
The periodic table of elements organizes all known matter in the universe into a coherent framework governed by quantum electron shell configurations. Looking up elemental constants across disparate physical chemistry reference books takes time; this interactive explorer compiles IUPAC standards into a single responsive client-side interface.
When to use it
Use when balancing stoichiometry equations in general chemistry, determining molar masses for lab preparations, studying orbital electron subshells, or learning element properties for AP Chemistry or university examinations.
Good to know
Atomic weights reflect standard IUPAC recommendations for terrestrial isotope distributions. For radioactive elements without stable isotopes, the mass number of the longest-lived known isotope is presented.
Common questions
How many chemical elements are in the modern periodic table?
There are currently 118 recognized chemical elements confirmed by IUPAC, ranging from Hydrogen (atomic number 1) to Oganesson (atomic number 118). Elements 1 through 94 occur naturally on Earth, while elements 95 through 118 are synthetic superheavy elements created in particle accelerators.
What do periods and groups signify in the periodic table?
Periods (the 7 horizontal rows) indicate the highest unexcited electron energy level occupied by the element's electrons. Groups (the 18 vertical columns) group elements with identical valence electron counts and similar chemical reactivity, such as group 1 alkali metals and group 18 noble gases.
What is electronegativity and why is it important?
Electronegativity is a dimensionless chemical property measuring an atom's ability to attract shared electrons in a chemical bond. Measured on the Pauling scale, Fluorine has the highest electronegativity (3.98), while Francium and Caesium have the lowest (~0.7), dictating ionic vs covalent bond character.
What are the four electron orbital blocks (s, p, d, f)?
The four blocks describe the atomic orbital subshell being filled with valence electrons: s-block (groups 1-2 plus Helium), p-block (groups 13-18), d-block (transition metals in groups 3-12), and f-block (lanthanides and actinides).
Which elements are liquid at standard room temperature (298 K)?
Only two elements are liquid at standard room temperature and atmospheric pressure: Bromine (a reactive halogen nonmetal, Br) and Mercury (a heavy transition metal, Hg). Gallium and Caesium melt just above room temperature (at ~29.8 °C and 28.5 °C respectively).