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Interactive periodic table
- Alkali metal
- Alkaline earth metal
- Transition metal
- Post-transition metal
- Metalloid
- Nonmetal
- Halogen
- Noble gas
- Lanthanide
- Actinide
No. 118 elements — free & open
Explore the periodic table, element by element.
A free, modern, ad-light reference for students, teachers and the chemistry-curious. Interactive table, calculators and clear write-ups for every element — no clutter, no logins.
Calculators
Tools
Free chemistry calculators that run right in your browser — no signup, no install.
- 01Molar Mass CalculatorParses any formula — parentheses, hydrates, all of it — into a full per-element mass breakdown.
- 02Electron Configuration GeneratorFull and noble-gas notation, with an orbital box diagram, for any element.
- 03Chemical Equation BalancerBalances equations automatically and shows the coefficients step by step.
- 04Compare ElementsPut 2-4 elements side by side across every property, with a shareable link.
From the blog
Learn the concepts
Clear, original explainers — how to read the table, how the calculators work, and more.
Atomic Mass vs. Mass Number vs. Molar Mass: What's the Difference?
Three terms that sound interchangeable but mean genuinely different things — a whole-number count, a weighted average, and a per-mole quantity — explained with real numbers.
Read the post →What Is the Densest Element? A Ranked List
Osmium is the densest naturally occurring element at standard conditions, narrowly ahead of iridium — with real density values for the top 10, and why density isn't as simple as it sounds.
Sep 23, 2026Ionic vs. Covalent Bonds: What's the Difference?
Why sodium and chlorine give away electrons while two oxygen atoms share theirs — and how to predict which kind of bond a pair of elements will form.