| Click an element to see its details. |
Select a property to visualize trends across the periodic table:
Electronegativity is a measure of an atom's ability to attract shared electrons in a chemical bond. Higher values indicate stronger attraction for electrons.
This visualization shows how selected properties vary across the periodic table. Apply a trend to see how values increase or decrease across periods and groups.
Click on elements in the main periodic table after applying a trend to see their specific values.
Adjust the temperature slider to see how element states change:
Notable Temperature Points:
Select a difficulty level and click "Start Quiz" to begin.
Drag the slider through history and watch elements light up in the year they were discovered or first synthesized.
In 1869 Mendeleev left gaps in his table and predicted the properties of elements no one had found yet. He was strikingly right:
Pick something and the table lights up the elements it's made of (by mass). Ever wonder what's really inside your phone — or you?
Short interactive tours that highlight parts of the table and explain one idea at a time. Pick one to start.
Pick two elements and see how they bond — who gives, who takes, who shares, and what they make.
Add and remove particles to build any atom. Protons set the element, neutrons the isotope, electrons the charge.
The proton count never changes — that's what makes it this element. Slide to add or remove neutrons and you build different isotopes of the same element.
Electrons fill the lowest-energy orbital first (the Aufbau principle). Watch the order — notice that 4s fills before 3d.