Periodic table of orbitals and electron configurations

Interactive periodic table with orbital box diagrams and electron configurations for all 118 elements, following the aufbau principle and Hund’s rule. ElementWorks is a free interactive periodic table: hover an element to preview it, click it for its full card, or pick another view from the Show menu.

Periodic table of orbitals and electron configurations explained

An electron configuration lists how an atom’s electrons fill its orbitals, such as 1s² 2s² 2p⁶ for neon. Electrons fill the lowest energy orbitals first (aufbau principle), each orbital holds at most two electrons with opposite spins (Pauli exclusion principle), and electrons occupy empty orbitals of the same energy singly before pairing (Hund’s rule). Click an element to see its orbital box diagram.

Data table

Show the full data table (all 118 elements)

Electron configuration of all 118 elements
No.	Symbol	Element	Electron configuration
1	H	Hydrogen	1s1
2	He	Helium	1s2
3	Li	Lithium	[He] 2s1
4	Be	Beryllium	[He] 2s2
5	B	Boron	[He] 2s2 2p1
6	C	Carbon	[He] 2s2 2p2
7	N	Nitrogen	[He] 2s2 2p3
8	O	Oxygen	[He] 2s2 2p4
9	F	Fluorine	[He] 2s2 2p5
10	Ne	Neon	[He] 2s2 2p6
11	Na	Sodium	[Ne] 3s1
12	Mg	Magnesium	[Ne] 3s2
13	Al	Aluminium	[Ne] 3s2 3p1
14	Si	Silicon	[Ne] 3s2 3p2
15	P	Phosphorus	[Ne] 3s2 3p3
16	S	Sulfur	[Ne] 3s2 3p4
17	Cl	Chlorine	[Ne] 3s2 3p5
18	Ar	Argon	[Ne] 3s2 3p6
19	K	Potassium	[Ar] 4s1
20	Ca	Calcium	[Ar] 4s2
21	Sc	Scandium	[Ar] 3d1 4s2
22	Ti	Titanium	[Ar] 3d2 4s2
23	V	Vanadium	[Ar] 3d3 4s2
24	Cr	Chromium	[Ar] 3d5 4s1
25	Mn	Manganese	[Ar] 3d5 4s2
26	Fe	Iron	[Ar] 3d6 4s2
27	Co	Cobalt	[Ar] 3d7 4s2
28	Ni	Nickel	[Ar] 3d8 4s2
29	Cu	Copper	[Ar] 3d10 4s1
30	Zn	Zinc	[Ar] 3d10 4s2
31	Ga	Gallium	[Ar] 3d10 4s2 4p1
32	Ge	Germanium	[Ar] 3d10 4s2 4p2
33	As	Arsenic	[Ar] 3d10 4s2 4p3
34	Se	Selenium	[Ar] 3d10 4s2 4p4
35	Br	Bromine	[Ar] 3d10 4s2 4p5
36	Kr	Krypton	[Ar] 3d10 4s2 4p6
37	Rb	Rubidium	[Kr] 5s1
38	Sr	Strontium	[Kr] 5s2
39	Y	Yttrium	[Kr] 4d1 5s2
40	Zr	Zirconium	[Kr] 4d2 5s2
41	Nb	Niobium	[Kr] 4d4 5s1
42	Mo	Molybdenum	[Kr] 4d5 5s1
43	Tc	Technetium	[Kr] 4d5 5s2
44	Ru	Ruthenium	[Kr] 4d7 5s1
45	Rh	Rhodium	[Kr] 4d8 5s1
46	Pd	Palladium	[Kr] 4d10
47	Ag	Silver	[Kr] 4d10 5s1
48	Cd	Cadmium	[Kr] 4d10 5s2
49	In	Indium	[Kr] 4d10 5s2 5p1
50	Sn	Tin	[Kr] 4d10 5s2 5p2
51	Sb	Antimony	[Kr] 4d10 5s2 5p3
52	Te	Tellurium	[Kr] 4d10 5s2 5p4
53	I	Iodine	[Kr] 4d10 5s2 5p5
54	Xe	Xenon	[Kr] 4d10 5s2 5p6
55	Cs	Cesium	[Xe] 6s1
56	Ba	Barium	[Xe] 6s2
57	La	Lanthanum	[Xe] 5d1 6s2
58	Ce	Cerium	[Xe] 4f1 5d1 6s2
59	Pr	Praseodymium	[Xe] 4f3 6s2
60	Nd	Neodymium	[Xe] 4f4 6s2
61	Pm	Promethium	[Xe] 4f5 6s2
62	Sm	Samarium	[Xe] 4f6 6s2
63	Eu	Europium	[Xe] 4f7 6s2
64	Gd	Gadolinium	[Xe] 4f7 5d1 6s2
65	Tb	Terbium	[Xe] 4f9 6s2
66	Dy	Dysprosium	[Xe] 4f10 6s2
67	Ho	Holmium	[Xe] 4f11 6s2
68	Er	Erbium	[Xe] 4f12 6s2
69	Tm	Thulium	[Xe] 4f13 6s2
70	Yb	Ytterbium	[Xe] 4f14 6s2
71	Lu	Lutetium	[Xe] 4f14 5d1 6s2
72	Hf	Hafnium	[Xe] 4f14 5d2 6s2
73	Ta	Tantalum	[Xe] 4f14 5d3 6s2
74	W	Tungsten	[Xe] 4f14 5d4 6s2
75	Re	Rhenium	[Xe] 4f14 5d5 6s2
76	Os	Osmium	[Xe] 4f14 5d6 6s2
77	Ir	Iridium	[Xe] 4f14 5d7 6s2
78	Pt	Platinum	[Xe] 4f14 5d9 6s1
79	Au	Gold	[Xe] 4f14 5d10 6s1
80	Hg	Mercury	[Xe] 4f14 5d10 6s2
81	Tl	Thallium	[Xe] 4f14 5d10 6s2 6p1
82	Pb	Lead	[Xe] 4f14 5d10 6s2 6p2
83	Bi	Bismuth	[Xe] 4f14 5d10 6s2 6p3
84	Po	Polonium	[Xe] 4f14 5d10 6s2 6p4
85	At	Astatine	[Xe] 4f14 5d10 6s2 6p5
86	Rn	Radon	[Xe] 4f14 5d10 6s2 6p6
87	Fr	Francium	[Rn] 7s1
88	Ra	Radium	[Rn] 7s2
89	Ac	Actinium	[Rn] 6d1 7s2
90	Th	Thorium	[Rn] 6d2 7s2
91	Pa	Protactinium	[Rn] 5f2 6d1 7s2
92	U	Uranium	[Rn] 5f3 6d1 7s2
93	Np	Neptunium	[Rn] 5f4 6d1 7s2
94	Pu	Plutonium	[Rn] 5f6 7s2
95	Am	Americium	[Rn] 5f7 7s2
96	Cm	Curium	[Rn] 5f7 6d1 7s2
97	Bk	Berkelium	[Rn] 5f9 7s2
98	Cf	Californium	[Rn] 5f10 7s2
99	Es	Einsteinium	[Rn] 5f11 7s2
100	Fm	Fermium	[Rn] 5f12 7s2
101	Md	Mendelevium	[Rn] 5f13 7s2
102	No	Nobelium	[Rn] 5f14 7s2
103	Lr	Lawrencium	[Rn] 5f14 7s2 7p1
104	Rf	Rutherfordium	[Rn] 5f14 6d2 7s2
105	Db	Dubnium	[Rn] 5f14 6d3 7s2
106	Sg	Seaborgium	[Rn] 5f14 6d4 7s2
107	Bh	Bohrium	[Rn] 5f14 6d5 7s2
108	Hs	Hassium	[Rn] 5f14 6d6 7s2
109	Mt	Meitnerium	[Rn] 5f14 6d7 7s2
110	Ds	Darmstadtium	[Rn] 5f14 6d8 7s2
111	Rg	Roentgenium	[Rn] 5f14 6d9 7s2
112	Cn	Copernicium	[Rn] 5f14 6d10 7s2
113	Nh	Nihonium	[Rn] 5f14 6d10 7s2 7p1
114	Fl	Flerovium	[Rn] 5f14 6d10 7s2 7p2
115	Mc	Moscovium	[Rn] 5f14 6d10 7s2 7p3
116	Lv	Livermorium	[Rn] 5f14 6d10 7s2 7p4
117	Ts	Tennessine	[Rn] 5f14 6d10 7s2 7p5
118	Og	Oganesson	[Rn] 5f14 6d10 7s2 7p6

Frequently asked questions

What is Hund’s rule?

Within a set of orbitals of equal energy, each orbital gets one electron with parallel spin before any orbital gets a second electron.

What is the noble gas shorthand for an electron configuration?

You write the symbol of the previous noble gas in brackets, then the remaining orbitals. For example sodium is [Ne] 3s¹.

Which elements are exceptions to the filling order?

Chromium and copper are the classic cases: [Ar] 3d⁵ 4s¹ and [Ar] 3d¹⁰ 4s¹, because half-filled and filled d subshells are especially stable.