Periodic Table
Explore all 118 elements, inspect their properties, and use them in chemistry calculations.
118 elements · 18 groups · 7 periods · f-block below
Lanthanides (57–71) and actinides (89–103) are shown in the two rows below the main table. Atomic weights follow CIAAW-2021; bracketed values are the mass number of the most stable isotope.
About
About this periodic table
Explore all 118 chemical elements in an interactive periodic table. Select any element to view its atomic number, atomic weight, group, electron configuration, common oxidation states, and key physical properties.
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FAQ
Periodic table questions
How many elements are in the periodic table?
There are 118 officially recognized chemical elements.
How is the periodic table organized?
Elements are arranged by increasing atomic number. Elements in the same group often share related chemical properties.
What is an atomic number?
The atomic number is the number of protons in an element’s nucleus.
What is atomic weight?
Atomic weight represents the standard atomic-weight value for an element based on its naturally occurring isotopic composition where applicable.
What is a group?
A group is a vertical column in the periodic table.
What is a period?
A period is a horizontal row in the periodic table.
What are the s, p, d, and f blocks?
They describe the type of atomic orbital being filled by the element’s electrons.
Can I search the periodic table?
Yes. Search by element name, symbol, or atomic number.
Can I use an element in Chemistry Inspect calculators?
Yes. The selected-element panel provides relevant links to Chemistry Inspect calculation tools.