Periodic Table of Elements
Interactive periodic table with element details, atomic number, atomic mass, electron configuration, and properties.
About this reference
Browse the periodic table, search by name, symbol or number, and read each element's atomic number, atomic mass, electron configuration and basic properties.
All 118 confirmed elements are included.
How to use it
- Search or click an element.
- Read its details.
- Use colours to see categories.
How the table is organised
Elements are arranged by atomic number (protons in the nucleus). Rows are periods (1 to 7); columns are groups (1 to 18) with similar properties. Groups include alkali metals (group 1), alkaline earth metals (2), halogens (17) and noble gases (18). Metals lie to the left, non-metals to the right, with metalloids along the staircase. Atomic mass is the weighted average mass of an element's isotopes.
Worked example
Examples
| Hydrogen (H) | atomic number 1, mass 1.008 |
| Carbon (C) | 6, 12.011, 1s² 2s² 2p² |
| Iron (Fe) | 26, 55.845 |
| Gold (Au) | 79, 196.97 |
| Oganesson (Og) | 118, heaviest named element |
Tips and common mistakes
- Learn groups first, then periods.
- Group number shows valence electrons for the main groups.
- Atomic number identifies an element.
- Use colour categories to learn properties.
- Practise with flashcards.
Frequently asked questions
How many elements are there?
118 confirmed elements.
What is atomic number?
The number of protons.
What are groups?
Vertical columns with similar properties.
What are noble gases?
Group 18, mostly unreactive.
What is atomic mass?
Weighted average of isotope masses.
Is it free?
Yes.