Periodic Table of Elements — Search & Detailed Data for All 118 Elements

Look up every element from hydrogen to oganesson: search or browse the periodic table for atomic number, atomic mass, category, electron configuration, and melting/boiling points.

Last updated: 2026-09-05

Full list of all 118 elements

Atomic no.	Symbol	Name	Atomic mass
1	H	Hydrogen	1.008
2	He	Helium	4.003
3	Li	Lithium	6.94
4	Be	Beryllium	9.012
5	B	Boron	10.81
6	C	Carbon	12.011
7	N	Nitrogen	14.007
8	O	Oxygen	15.999
9	F	Fluorine	18.998
10	Ne	Neon	20.18
11	Na	Sodium	22.99
12	Mg	Magnesium	24.305
13	Al	Aluminium	26.982
14	Si	Silicon	28.085
15	P	Phosphorus	30.974
16	S	Sulfur	32.06
17	Cl	Chlorine	35.45
18	Ar	Argon	39.948
19	K	Potassium	39.098
20	Ca	Calcium	40.078
21	Sc	Scandium	44.956
22	Ti	Titanium	47.867
23	V	Vanadium	50.942
24	Cr	Chromium	51.996
25	Mn	Manganese	54.938
26	Fe	Iron	55.845
27	Co	Cobalt	58.933
28	Ni	Nickel	58.693
29	Cu	Copper	63.546
30	Zn	Zinc	65.38
31	Ga	Gallium	69.723
32	Ge	Germanium	72.63
33	As	Arsenic	74.922
34	Se	Selenium	78.971
35	Br	Bromine	79.904
36	Kr	Krypton	83.798
37	Rb	Rubidium	85.468
38	Sr	Strontium	87.62
39	Y	Yttrium	88.906
40	Zr	Zirconium	91.224
41	Nb	Niobium	92.906
42	Mo	Molybdenum	95.95
43	Tc	Technetium	[98]
44	Ru	Ruthenium	101.07
45	Rh	Rhodium	102.91
46	Pd	Palladium	106.42
47	Ag	Silver	107.87
48	Cd	Cadmium	112.41
49	In	Indium	114.82
50	Sn	Tin	118.71
51	Sb	Antimony	121.76
52	Te	Tellurium	127.6
53	I	Iodine	126.9
54	Xe	Xenon	131.29
55	Cs	Caesium	132.91
56	Ba	Barium	137.33
57	La	Lanthanum	138.91
58	Ce	Cerium	140.12
59	Pr	Praseodymium	140.91
60	Nd	Neodymium	144.24
61	Pm	Promethium	[145]
62	Sm	Samarium	150.36
63	Eu	Europium	151.96
64	Gd	Gadolinium	157.25
65	Tb	Terbium	158.93
66	Dy	Dysprosium	162.5
67	Ho	Holmium	164.93
68	Er	Erbium	167.26
69	Tm	Thulium	168.93
70	Yb	Ytterbium	173.05
71	Lu	Lutetium	174.97
72	Hf	Hafnium	178.49
73	Ta	Tantalum	180.95
74	W	Tungsten	183.84
75	Re	Rhenium	186.21
76	Os	Osmium	190.23
77	Ir	Iridium	192.22
78	Pt	Platinum	195.08
79	Au	Gold	196.97
80	Hg	Mercury	200.59
81	Tl	Thallium	204.38
82	Pb	Lead	207.2
83	Bi	Bismuth	208.98
84	Po	Polonium	[209]
85	At	Astatine	[210]
86	Rn	Radon	[222]
87	Fr	Francium	[223]
88	Ra	Radium	[226]
89	Ac	Actinium	[227]
90	Th	Thorium	232.04
91	Pa	Protactinium	231.04
92	U	Uranium	238.03
93	Np	Neptunium	[237]
94	Pu	Plutonium	[244]
95	Am	Americium	[243]
96	Cm	Curium	[247]
97	Bk	Berkelium	[247]
98	Cf	Californium	[251]
99	Es	Einsteinium	[252]
100	Fm	Fermium	[257]
101	Md	Mendelevium	[258]
102	No	Nobelium	[259]
103	Lr	Lawrencium	[266]
104	Rf	Rutherfordium	[267]
105	Db	Dubnium	[268]
106	Sg	Seaborgium	[269]
107	Bh	Bohrium	[270]
108	Hs	Hassium	[269]
109	Mt	Meitnerium	[278]
110	Ds	Darmstadtium	[281]
111	Rg	Roentgenium	[282]
112	Cn	Copernicium	[285]
113	Nh	Nihonium	[286]
114	Fl	Flerovium	[289]
115	Mc	Moscovium	[290]
116	Lv	Livermorium	[293]
117	Ts	Tennessine	[294]
118	Og	Oganesson	[294]

A bracketed atomic mass is the mass number of the most stable known isotope of an element that has no stable isotope of its own.

What the periodic table shows

The periodic table arranges the 118 elements known today, from hydrogen to oganesson, in order of atomic number — the number of protons in the nucleus — so that elements with similar chemical behaviour line up in the same vertical column, or group. It is more than a list: the layout itself expresses how the elements relate to one another, so knowing an element’s group and period already tells you roughly how reactive it is and whether it behaves as a metal or a non-metal.

Here you can search all 118 elements by atomic number, symbol, atomic weight, category, electron configuration, melting and boiling points and year of discovery, and see the result highlighted on the table itself. Instead of leafing through a textbook, you type a name, a symbol or a number and arrive at the element directly, while the colour coding by group and period makes the relationships between elements visible at a glance.

How to use the table

Search for an element Type an element name, symbol or atomic number into the search box and the matching element is highlighted on the grid.
Click a cell directly You can also click a square on the table without searching; the same detail panel opens. This is handy when you are navigating by position.
Read the detail panel Atomic number, atomic weight, category, period, group, electron configuration, melting and boiling points and the year and discoverer are listed together.
Check the colour key The legend below the table explains the ten categories used for the colour coding, from alkali metals through transition metals to noble gases.

Tips for getting more out of it

Search by element name, symbol, or atomic number to instantly highlight it on the periodic table grid.
Elements in the same group (vertical column) share a similar outer electron configuration, so pay attention to group numbers when comparing chemical behavior.
Transition metals, lanthanides, and actinides are color-coded, making it easy to see the distribution of metals, nonmetals, and metalloids at a glance.
When an atomic mass looks like a bracketed value, the element has no stable isotope — the number shown is the mass of its longest-lived known isotope instead.
Electron configurations are simplified; well-known exceptions among transition metals (like chromium and copper) are already reflected in the data.

When the table is useful

Chemistry lessons and exam revision

Look up symbols, atomic numbers and the relationship between group and period on the spot, without opening a textbook — useful for last-minute checking before a test.

Finding atomic weights before a molar calculation

Mole calculations need the atomic weight of each element. Once you have them, the molar mass calculator handles the arithmetic.

Moving from a radioactive element to a decay calculation

Having identified an element with no stable isotope, such as an actinide, the half-life calculator works out how much of a nuclide remains after a given time.

Preparing reports and presentations

When a document needs accurate figures for category, electron configuration or melting and boiling points, you can quote them without reaching for a textbook.

Starting research into how elements were named and found

The year and the discoverer give you a starting point for looking into when and how each element came to light.

Terms used with the periodic table

Atomic number: The number of protons in an element’s nucleus. The table orders elements by it, and two atoms with the same atomic number are always the same element.
Atomic weight: A weighted average of the mass numbers of the naturally occurring isotopes, according to their abundance. For elements with no stable isotope, the mass number of the most stable one is given in square brackets instead.
Electron configuration: How the electrons around the nucleus are distributed among shells and orbitals. The configuration of the outermost shell largely governs the element’s chemistry.
Group: A vertical column of the table, numbered 1 to 18. Elements in the same group share the number of outer-shell electrons and therefore tend to behave alike.
Period: A horizontal row of the table, numbered 1 to 7. The period number corresponds to the number of electron shells, and atomic number rises as you move right.
Ionisation energy: The energy needed to remove one electron from an atom and leave a positive ion. It tends to rise across a period and to fall down a group.
Transition metals: The elements in groups 3 to 12. They readily take several oxidation states and often form coloured compounds; iron, copper and zinc are familiar examples.
Metalloid: An element with properties between those of metals and non-metals. Boron, silicon and germanium belong here, and they are widely used as semiconductor materials.

Frequently Asked Questions

A vertical column is called a 'group,' and a horizontal row is called a 'period.' Elements in the same group tend to share chemical properties because they have the same number of outer-shell electrons, while the period roughly corresponds to how many electron shells an atom has.

Metalloids sit between metals and nonmetals in their properties. Boron, silicon, germanium, arsenic, antimony, and tellurium are typical examples — silicon and germanium in particular are widely used as semiconductor materials.

If placed in their actual position (group 3, periods 6 and 7), the table would become far too wide for a practical layout, so they are conventionally split out into two rows below. Chemically, they still belong to group 3.

Atomic mass is a weighted average of the natural abundances of an element's isotopes, so elements with multiple naturally occurring isotopes end up with a decimal value. Artificially created elements have no stable isotope, so the mass number of their most stable known isotope is shown in brackets instead.

Some elements, like hydrogen and oxygen, have a clearly documented discoverer and discovery year. Others, such as iron, copper, and gold, have been used by humans since prehistoric times, so no single discoverer can be identified — this tool labels those elements as 'known since antiquity.'

Side Note — A Table Born from Blank Squares and Bold Predictions

In 1869, Russian chemist Dmitri Mendeleev arranged the 63 elements known at the time by atomic weight and noticed that their properties repeated in a periodic pattern. What made his table revolutionary wasn't just the classification — he deliberately left blank squares, predicting that undiscovered elements would eventually fill them. When gallium and germanium were later discovered, their properties matched his predictions almost perfectly, cementing the table's credibility.

Modern periodic tables are ordered by atomic number (proton count) rather than atomic weight. This became possible once the structure of the atomic nucleus was understood in the early 20th century, resolving exceptions like tellurium and iodine, whose atomic-weight order would otherwise break the periodicity of their chemical properties.

Element 113, nihonium, was the first new element credited to an Asian research team: RIKEN in Japan, following experiments conducted between 2004 and 2012. The table's blank squares aren't fully filled even today — the search for elements beyond 118, the hypothetical start of an eighth period, remains an active research topic at laboratories worldwide.

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