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Chemistry Reference
Interactive Periodic Table of Elements
Click any element below to inspect its atomic number, mass weight, valence electrons, and electronic configuration. Explore full facts and take practice quizzes on dedicated element pages.
Periodic Elements (First 20 Elements)
1HHydrogen
2HeHelium
3LiLithium
4BeBeryllium
5BBoron
6CCarbon
7NNitrogen
8OOxygen
9FFluorine
10NeNeon
11NaSodium
12MgMagnesium
13AlAluminium
14SiSilicon
15PPhosphorus
16SSulfur
17ClChlorine
18ArArgon
19KPotassium
20CaCalcium
Element Properties
HHydrogen
Atomic Number1
Atomic Weight1.008 u
Bohr Shell Structure1
Electronic Config1s¹
Standard PhaseGas/Solid
Category Groupnonmetal
Valence electrons in the outermost shell govern how this element reacts with other compounds.
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