Ferrum Periodic Table is an interactive chemistry tool for exploring all 118 elements with their symbols and core properties. Each cell shows atomic number, symbol and category; open an element detail page for atomic mass, electron configuration, melting and boiling points, discovery notes and study tips. It is designed to help you interpret periodic system questions quickly during chemistry exam prep.

Ordered by Atomic Number

The modern periodic table arranges elements by increasing atomic number. Atomic number is the number of protons in the nucleus and defines the identity of each element, starting with Hydrogen (1), Helium (2) and Lithium (3).

Groups, Periods and Electron Configuration

Rows are periods and columns are groups. Electron configuration helps explain shells, valence electrons and s, p, d and f blocks, making it easier to understand metals, nonmetals, halogens and noble gases.

A Fast Chemistry Reference

Use the table as a chemistry reference for atomic radius, ionization energy, electronegativity, metallic character, valence electrons, group numbers and period numbers.

How to Read the Periodic Table

A useful periodic table should do more than display a chart. It should connect atomic number, group, period, electron configuration and periodic trends in one place. Ferrum combines those ideas with an interactive table: search by element name, symbol or atomic number, compare element categories by color, use temperature mode to see solid, liquid and gas behavior, and open element detail pages. Across a period from left to right, atomic radius generally decreases while ionization energy and electronegativity tend to increase. Down a group, added electron shells make atoms larger and related chemical properties repeat.

A Short History of the Periodic Table

The periodic table is based on the repeating patterns of element properties. In 1869, Dmitri Mendeleev arranged elements by atomic mass and similar chemical behavior, even predicting properties of elements that had not yet been discovered. Later, Henry Moseley showed that the correct order depends on atomic number, the number of protons in the nucleus. The modern periodic table follows this atomic number order, which is why it is useful not only for memorizing symbols but also for predicting chemical behavior.

First 20 Elements

The first 20 elements form the foundation for symbol, atomic number and electron configuration questions in introductory chemistry. Hydrogen, helium, carbon, nitrogen, oxygen, fluorine, sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, argon, potassium and calcium appear especially often in formulas, valence electron reasoning and periodic trends.

Group Properties

Group 1 alkali metals: elements like lithium, sodium and potassium with strong +1 valence tendency.
Group 2 alkaline earth metals: metals like magnesium and calcium with +2 valence tendency.
Group 17 halogens: nonmetals like fluorine, chlorine, bromine and iodine with high electron affinity.
Group 18 noble gases: elements like helium, neon and argon with stable electron configurations.

All Elements (118)

Links to detail pages for all 118 elements. Compare atomic number, symbol, group, period and electron configuration, then open any element for properties, uses and isotope information.

Atomic No	Symbol	Element	Group	Period	Electron Config
1	H	Hydrogen	Group 1 (Nonmetal)	Period 1	`1s¹`
2	He	Helium	Group 18 (Noble Gas)	Period 1	`1s²`
3	Li	Lithium	Group 1 (Alkali Metal)	Period 2	`[He] 2s¹`
4	Be	Beryllium	Group 2 (Alkaline Earth Metal)	Period 2	`[He] 2s²`
5	B	Boron	Group 13 (Metalloid)	Period 2	`[He] 2s² 2p¹`
6	C	Carbon	Group 14 (Nonmetal)	Period 2	`[He] 2s² 2p²`
7	N	Nitrogen	Group 15 (Nonmetal)	Period 2	`[He] 2s² 2p³`
8	O	Oxygen	Group 16 (Nonmetal)	Period 2	`[He] 2s² 2p⁴`
9	F	Fluorine	Group 17 (Halogen)	Period 2	`[He] 2s² 2p⁵`
10	Ne	Neon	Group 18 (Noble Gas)	Period 2	`[He] 2s² 2p⁶`
11	Na	Sodium	Group 1 (Alkali Metal)	Period 3	`[Ne] 3s¹`
12	Mg	Magnesium	Group 2 (Alkaline Earth Metal)	Period 3	`[Ne] 3s²`
13	Al	Aluminum	Group 13 (Post-Transition Metal)	Period 3	`[Ne] 3s² 3p¹`
14	Si	Silicon	Group 14 (Metalloid)	Period 3	`[Ne] 3s² 3p²`
15	P	Phosphorus	Group 15 (Nonmetal)	Period 3	`[Ne] 3s² 3p³`
16	S	Sulfur	Group 16 (Nonmetal)	Period 3	`[Ne] 3s² 3p⁴`
17	Cl	Chlorine	Group 17 (Halogen)	Period 3	`[Ne] 3s² 3p⁵`
18	Ar	Argon	Group 18 (Noble Gas)	Period 3	`[Ne] 3s² 3p⁶`
19	K	Potassium	Group 1 (Alkali Metal)	Period 4	`[Ar] 4s¹`
20	Ca	Calcium	Group 2 (Alkaline Earth Metal)	Period 4	`[Ar] 4s²`
21	Sc	Scandium	Group 3 (Transition Metal)	Period 4	`[Ar] 3d¹ 4s²`
22	Ti	Titanium	Group 4 (Transition Metal)	Period 4	`[Ar] 3d² 4s²`
23	V	Vanadium	Group 5 (Transition Metal)	Period 4	`[Ar] 3d³ 4s²`
24	Cr	Chromium	Group 6 (Transition Metal)	Period 4	`[Ar] 3d⁵ 4s¹`
25	Mn	Manganese	Group 7 (Transition Metal)	Period 4	`[Ar] 3d⁵ 4s²`
26	Fe	Iron	Group 8 (Transition Metal)	Period 4	`[Ar] 3d⁶ 4s²`
27	Co	Cobalt	Group 9 (Transition Metal)	Period 4	`[Ar] 3d⁷ 4s²`
28	Ni	Nickel	Group 10 (Transition Metal)	Period 4	`[Ar] 3d⁸ 4s²`
29	Cu	Copper	Group 11 (Transition Metal)	Period 4	`[Ar] 3d¹⁰ 4s¹`
30	Zn	Zinc	Group 12 (Transition Metal)	Period 4	`[Ar] 3d¹⁰ 4s²`
31	Ga	Gallium	Group 13 (Post-Transition Metal)	Period 4	`[Ar] 3d¹⁰ 4s² 4p¹`
32	Ge	Germanium	Group 14 (Metalloid)	Period 4	`[Ar] 3d¹⁰ 4s² 4p²`
33	As	Arsenic	Group 15 (Metalloid)	Period 4	`[Ar] 3d¹⁰ 4s² 4p³`
34	Se	Selenium	Group 16 (Nonmetal)	Period 4	`[Ar] 3d¹⁰ 4s² 4p⁴`
35	Br	Bromine	Group 17 (Halogen)	Period 4	`[Ar] 3d¹⁰ 4s² 4p⁵`
36	Kr	Krypton	Group 18 (Noble Gas)	Period 4	`[Ar] 3d¹⁰ 4s² 4p⁶`
37	Rb	Rubidium	Group 1 (Alkali Metal)	Period 5	`[Kr] 5s¹`
38	Sr	Strontium	Group 2 (Alkaline Earth Metal)	Period 5	`[Kr] 5s²`
39	Y	Yttrium	Group 3 (Transition Metal)	Period 5	`[Kr] 4d¹ 5s²`
40	Zr	Zirconium	Group 4 (Transition Metal)	Period 5	`[Kr] 4d² 5s²`
41	Nb	Niobium	Group 5 (Transition Metal)	Period 5	`[Kr] 4d⁴ 5s¹`
42	Mo	Molybdenum	Group 6 (Transition Metal)	Period 5	`[Kr] 4d⁵ 5s¹`
43	Tc	Technetium	Group 7 (Transition Metal)	Period 5	`[Kr] 4d⁵ 5s²`
44	Ru	Ruthenium	Group 8 (Transition Metal)	Period 5	`[Kr] 4d⁷ 5s¹`
45	Rh	Rhodium	Group 9 (Transition Metal)	Period 5	`[Kr] 4d⁸ 5s¹`
46	Pd	Palladium	Group 10 (Transition Metal)	Period 5	`[Kr] 4d¹⁰`
47	Ag	Silver	Group 11 (Transition Metal)	Period 5	`[Kr] 4d¹⁰ 5s¹`
48	Cd	Cadmium	Group 12 (Transition Metal)	Period 5	`[Kr] 4d¹⁰ 5s²`
49	In	Indium	Group 13 (Post-Transition Metal)	Period 5	`[Kr] 4d¹⁰ 5s² 5p¹`
50	Sn	Tin	Group 14 (Post-Transition Metal)	Period 5	`[Kr] 4d¹⁰ 5s² 5p²`
51	Sb	Antimony	Group 15 (Metalloid)	Period 5	`[Kr] 4d¹⁰ 5s² 5p³`
52	Te	Tellurium	Group 16 (Metalloid)	Period 5	`[Kr] 4d¹⁰ 5s² 5p⁴`
53	I	Iodine	Group 17 (Halogen)	Period 5	`[Kr] 4d¹⁰ 5s² 5p⁵`
54	Xe	Xenon	Group 18 (Noble Gas)	Period 5	`[Kr] 4d¹⁰ 5s² 5p⁶`
55	Cs	Cesium	Group 1 (Alkali Metal)	Period 6	`[Xe] 6s¹`
56	Ba	Barium	Group 2 (Alkaline Earth Metal)	Period 6	`[Xe] 6s²`
57	La	Lanthanum	Group 0 (Lanthanide)	Period 6	`[Xe] 5d¹ 6s²`
58	Ce	Cerium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f¹ 5d¹ 6s²`
59	Pr	Praseodymium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f³ 6s²`
60	Nd	Neodymium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f⁴ 6s²`
61	Pm	Promethium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f⁵ 6s²`
62	Sm	Samarium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f⁶ 6s²`
63	Eu	Europium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f⁷ 6s²`
64	Gd	Gadolinium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f⁷ 5d¹ 6s²`
65	Tb	Terbium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f⁹ 6s²`
66	Dy	Dysprosium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f¹⁰ 6s²`
67	Ho	Holmium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f¹¹ 6s²`
68	Er	Erbium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f¹² 6s²`
69	Tm	Thulium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f¹³ 6s²`
70	Yb	Ytterbium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f¹⁴ 6s²`
71	Lu	Lutetium	Group 0 (Lanthanide)	Period 6	`[Xe] 4f¹⁴ 5d¹ 6s²`
72	Hf	Hafnium	Group 4 (Transition Metal)	Period 6	`[Xe] 4f¹⁴ 5d² 6s²`
73	Ta	Tantalum	Group 5 (Transition Metal)	Period 6	`[Xe] 4f¹⁴ 5d³ 6s²`
74	W	Tungsten	Group 6 (Transition Metal)	Period 6	`[Xe] 4f¹⁴ 5d⁴ 6s²`
75	Re	Rhenium	Group 7 (Transition Metal)	Period 6	`[Xe] 4f¹⁴ 5d⁵ 6s²`
76	Os	Osmium	Group 8 (Transition Metal)	Period 6	`[Xe] 4f¹⁴ 5d⁶ 6s²`
77	Ir	Iridium	Group 9 (Transition Metal)	Period 6	`[Xe] 4f¹⁴ 5d⁷ 6s²`
78	Pt	Platinum	Group 10 (Transition Metal)	Period 6	`[Xe] 4f¹⁴ 5d⁹ 6s¹`
79	Au	Gold	Group 11 (Transition Metal)	Period 6	`[Xe] 4f¹⁴ 5d¹⁰ 6s¹`
80	Hg	Mercury	Group 12 (Transition Metal)	Period 6	`[Xe] 4f¹⁴ 5d¹⁰ 6s²`
81	Tl	Thallium	Group 13 (Post-Transition Metal)	Period 6	`[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹`
82	Pb	Lead	Group 14 (Post-Transition Metal)	Period 6	`[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p²`
83	Bi	Bismuth	Group 15 (Post-Transition Metal)	Period 6	`[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³`
84	Po	Polonium	Group 16 (Post-Transition Metal)	Period 6	`[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁴`
85	At	Astatine	Group 17 (Halogen)	Period 6	`[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵`
86	Rn	Radon	Group 18 (Noble Gas)	Period 6	`[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶`
87	Fr	Francium	Group 1 (Alkali Metal)	Period 7	`[Rn] 7s¹`
88	Ra	Radium	Group 2 (Alkaline Earth Metal)	Period 7	`[Rn] 7s²`
89	Ac	Actinium	Group 0 (Actinide)	Period 7	`[Rn] 6d¹ 7s²`
90	Th	Thorium	Group 0 (Actinide)	Period 7	`[Rn] 6d² 7s²`
91	Pa	Protactinium	Group 0 (Actinide)	Period 7	`[Rn] 5f² 6d¹ 7s²`
92	U	Uranium	Group 0 (Actinide)	Period 7	`[Rn] 5f³ 6d¹ 7s²`
93	Np	Neptunium	Group 0 (Actinide)	Period 7	`[Rn] 5f⁴ 6d¹ 7s²`
94	Pu	Plutonium	Group 0 (Actinide)	Period 7	`[Rn] 5f⁶ 7s²`
95	Am	Americium	Group 0 (Actinide)	Period 7	`[Rn] 5f⁷ 7s²`
96	Cm	Curium	Group 0 (Actinide)	Period 7	`[Rn] 5f⁷ 6d¹ 7s²`
97	Bk	Berkelium	Group 0 (Actinide)	Period 7	`[Rn] 5f⁹ 7s²`
98	Cf	Californium	Group 0 (Actinide)	Period 7	`[Rn] 5f¹⁰ 7s²`
99	Es	Einsteinium	Group 0 (Actinide)	Period 7	`[Rn] 5f¹¹ 7s²`
100	Fm	Fermium	Group 0 (Actinide)	Period 7	`[Rn] 5f¹² 7s²`
101	Md	Mendelevium	Group 0 (Actinide)	Period 7	`[Rn] 5f¹³ 7s²`
102	No	Nobelium	Group 0 (Actinide)	Period 7	`[Rn] 5f¹⁴ 7s²`
103	Lr	Lawrencium	Group 0 (Actinide)	Period 7	`[Rn] 5f¹⁴ 7s² 7p¹`
104	Rf	Rutherfordium	Group 4 (Transition Metal)	Period 7	`[Rn] 5f¹⁴ 6d² 7s²`
105	Db	Dubnium	Group 5 (Transition Metal)	Period 7	`[Rn] 5f¹⁴ 6d³ 7s²`
106	Sg	Seaborgium	Group 6 (Transition Metal)	Period 7	`[Rn] 5f¹⁴ 6d⁴ 7s²`
107	Bh	Bohrium	Group 7 (Transition Metal)	Period 7	`[Rn] 5f¹⁴ 6d⁵ 7s²`
108	Hs	Hassium	Group 8 (Transition Metal)	Period 7	`[Rn] 5f¹⁴ 6d⁶ 7s²`
109	Mt	Meitnerium	Group 9 (Unknown)	Period 7	`[Rn] 5f¹⁴ 6d⁷ 7s²`
110	Ds	Darmstadtium	Group 10 (Unknown)	Period 7	`[Rn] 5f¹⁴ 6d⁹ 7s¹`
111	Rg	Roentgenium	Group 11 (Unknown)	Period 7	`[Rn] 5f¹⁴ 6d¹⁰ 7s¹`
112	Cn	Copernicium	Group 12 (Transition Metal)	Period 7	`[Rn] 5f¹⁴ 6d¹⁰ 7s²`
113	Nh	Nihonium	Group 13 (Post-Transition Metal)	Period 7	`[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p¹`
114	Fl	Flerovium	Group 14 (Post-Transition Metal)	Period 7	`[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p²`
115	Mc	Moscovium	Group 15 (Post-Transition Metal)	Period 7	`[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p³`
116	Lv	Livermorium	Group 16 (Post-Transition Metal)	Period 7	`[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁴`
117	Ts	Tennessine	Group 17 (Halogen)	Period 7	`[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵`
118	Og	Oganesson	Group 18 (Noble Gas)	Period 7	`[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶`

Periodic Trends

Atomic radius

Generally decreases across a period and increases down a group. Nuclear charge and shell count are interpreted together.

Ionization energy

Energy required to remove an electron. Generally increases across a period and decreases down a group.

Electronegativity

Tendency to attract bonding electrons. Fluorine is the most electronegative element.

Frequently Asked Questions

What is the periodic table?

The periodic table arranges chemical elements by atomic number and groups elements with similar properties into periods and groups.

What information does the Ferrum Periodic Table show?

For each element it shows atomic number, symbol, name, atomic mass, electron configuration, group, period, melting and boiling points.

How do you find group and period on the periodic table?

Period is the horizontal row; group is the vertical column. The highest energy level in the electron configuration indicates the period.

Why is the periodic table important for chemistry exams?

Exam questions often use atomic number, electron configuration, metal/nonmetal classification, periodic trends and group-period interpretation.

What does atomic number mean?

Atomic number is the number of protons in an element's nucleus. Elements are ordered by increasing atomic number in the modern periodic table.

What is electron configuration used for?

Electron configuration helps determine an element's position, valence electrons, block type and chemical behavior.