What is the Interactive Periodic Table?

The Interactive Periodic Table is a free, modern web application that displays all 118 elements with detailed properties, 3D Bohr model visualizations, crystal structure renderings, and text-to-speech pronunciation. It works on desktop, tablet, and mobile devices.

What information is available for each element?

Each element page includes atomic number, atomic mass, electron configuration, physical properties (density, melting and boiling points, state of matter), chemical properties (electronegativity, ionization energy, electron affinity), an interactive 3D Bohr model, 3D crystal structure, and an AI-generated educational summary.

Can I use this periodic table for teaching?

Yes. The Interactive Periodic Table includes a full-screen mode designed for projectors and classroom presentations. All content is educational and completely free to use without registration.

Does it work on mobile devices?

Yes. The web app is fully responsive and also available as native iOS and Android apps that can be downloaded from the app stores.

What are the 3D visualizations?

Each element features an interactive 3D Bohr model showing electron shells orbiting the nucleus, and a 3D crystal structure rendering showing the element's atomic arrangement. Both are powered by Three.js and React Three Fiber.

Is this periodic table free?

Yes, the Interactive Periodic Table is completely free with no registration, no ads, and no data collection required.

How many elements are included?

All 118 confirmed elements from Hydrogen (H, atomic number 1) through Oganesson (Og, atomic number 118) are included with full data and visualizations.

Can I hear how element names are pronounced?

Yes. The text-to-speech feature allows you to hear the correct pronunciation of any element name. This works on both the web version and native mobile apps.

Protactinium (Pa)

Atomic Number	91
Atomic Mass	231.035882 u
Category	Actinide
Electron Config	[Rn] 5f² 6d¹ 7s²
Appearance	bright, silvery metallic luster
Density (STP)	15370 g/L
Melting Point	1841 K
Boiling Point	4300 K
Electronegativity	1.5 (Pauling)
Ionization Energy	568 kJ/mol
Atomic Radius	180 pm
Crystal Structure	Centered Tetragonal
Discovered By	William Crookes (1913)

Brief Introduction

Protactinium (Pa) is a highly radioactive, silvery-white metallic element that is extremely rare. It is toxic and requires special handling. Key details about Protactinium (Pa) are as follows:

Uses: No commercial applications. Used only in scientific research to study nuclear properties and actinide chemistry.

Production/Extraction: Occurs naturally in trace amounts as a decay product of uranium-235. Produced synthetically by bombarding thorium with neutrons. Extremely difficult and expensive to isolate.

History: Discovered in 1913 by Kasimir Fajans and Otto Göhring, and independently in 1918 by Frederick Soddy, John Cranston, and Otto Hahn. Named from Greek "protos" (first) and "actinium" because it decays to actinium.

Health Effects & Safety: Highly radiotoxic and chemically toxic. Emits alpha radiation. Accumulates in bones and kidneys. Requires strict containment and handling protocols.

Price/Market: Not commercially available. Produced only in minute quantities for research at great expense.

Properties: Radioactive, silvery metallic appearance, very dense (15.4 g/cm³), highly reactive, forms various oxidation states (+4 and +5 most common), melting point around 1572°C.

← Thorium (Th) · Uranium (U) →

Periodic Table