Periodic Table of Elements – Interactive

An interactive periodic table with all 118 elements — tap any element for its atomic number, mass, group, period and category.

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Tap an element to see its details.
57–71
89–103

Scroll sideways on a phone to see the whole table.

Interactive periodic table

The periodic table is the map of chemistry. This interactive version shows all 118 elements, colour-coded by family — alkali metals, transition metals, halogens, noble gases and more. Tap any element to see its atomic number, atomic mass, group, period, block, state at room temperature, and for the first 20 elements the electron arrangement taught in Class 9 and 10. Search by name, symbol or number, or tap a family to highlight it.

How to use it

  1. Tap an element, or search for it.
  2. Tap a category in the legend to highlight that family.
  3. Learn symbols faster with the chemical-symbols deck in flashcards.

Example

Sodium (Na) has atomic number 11 and atomic mass 22.990. It sits in group 1 (alkali metals), period 3, so its electrons are arranged 2, 8, 1 — the single outer electron is why sodium reacts so vigorously with water. Iron (Fe, 26) is a transition metal, and bromine and mercury are the only elements that are liquid at room temperature. Revise key chemistry formulas on the formula sheets.

Frequently asked questions

How many elements are there in the periodic table?
118 elements have been discovered and named. Elements 1 to 94 occur naturally on Earth (some only in traces); the rest have been made in laboratories. Element 118, oganesson, completes period 7.
How is the periodic table arranged?
Elements are arranged by increasing atomic number (number of protons) in 18 vertical groups and 7 horizontal periods. Elements in the same group have similar chemical properties because they have the same number of outer electrons.
Why are the lanthanides and actinides shown separately?
They belong in periods 6 and 7 between groups 2 and 3, but including them would make the table very wide. So they are placed in two rows below the main table.
What does the number in brackets mean?
Radioactive elements with no stable isotopes don’t have a standard atomic weight, so the table shows the mass number of their longest-lived isotope in brackets, for example Technetium [98].

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