Periodic Table of Elements -CoolGyan

The periodic table is the tabular arrangement of all the chemical elements on the basis of their respective atomic numbers. In the periodic table, the vertical columns are called ‘groups’ and the horizontal rows are called ‘periods’. The modern periodic table is based on the modern periodic law put forward by the English physicist Henry Moseley, which states that “the properties of elements are periodic functions of their atomic numbers”. Periodic trends in the properties of the elements can be observed down the groups and across the periods of the modern periodic table.

Every chemical element has a specific atomic number, which provides insight into the number of protons present within its nucleus. All isotopes of an element fall under a single cell on the periodic table, since they all share the same atomic number.

Periodic Table of Elements – Atomic Number, Atomic Mass, Groups & Symbols

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List of Chemical Elements

The table below consists of 118 elements of the periodic table, sorted by atomic number, atomic weight, symbols, density, discovered year and the group.

Atomic Number	Atomic Mass	Chemical Element Name	Symbol	Discovery (Year)	Group
1	1.0079	Hydrogen	H	1776	1
2	4.0026	Helium	He	1895	18
3	6.941	Lithium	Li	1817	1
4	9.0122	Beryllium	Be	1797	2
5	10.811	Boron	B	1808	13
6	12.0107	Carbon	C	Ancient	14
7	14.0067	Nitrogen	N	1772	15
8	15.9994	Oxygen	O	1774	16
9	18.9984	Fluorine	F	1886	17
10	20.1797	Neon	Ne	1898	18
11	22.9897	Sodium	Na	1807	1
12	24.305	Magnesium	Mg	1755	2
13	26.9815	Aluminum	Al	1825	13
14	28.0855	Silicon	Si	1824	14
15	30.9738	Phosphorus	P	1669	15
16	32.065	Sulfur	S	Ancient	16
17	35.453	Chlorine	Cl	1774	17
18	39.948	Argon	Ar	1894	18
19	39.0983	Potassium	K	1807	1
20	40.078	Calcium	Ca	1808	2
21	44.9559	Scandium	Sc	1879	3
22	47.867	Titanium	Ti	1791	4
23	50.9415	Vanadium	V	1830	5
24	51.9961	Chromium	Cr	1797	6
25	54.938	Manganese	Mn	1774	7
26	55.845	Iron	Fe	Ancient	8
27	58.9332	Cobalt	Co	1735	9
28	58.6934	Nickel	Ni	1751	10
29	63.546	Copper	Cu	Ancient	11
30	65.39	Zinc	Zn	Ancient	12
31	69.723	Gallium	Ga	1875	13
32	72.64	Germanium	Ge	1886	14
33	74.9216	Arsenic	As	Ancient	15
34	78.96	Selenium	Se	1817	16
35	79.904	Bromine	Br	1826	17
36	83.8	Krypton	Kr	1898	18
37	85.4678	Rubidium	Rb	1861	1
38	87.62	Strontium	Sr	1790	2
39	88.9059	Yttrium	Y	1794	3
40	91.224	Zirconium	Zr	1789	4
41	92.9064	Niobium	Nb	1801	5
42	95.94	Molybdenum	Mo	1781	6
43	98	Technetium	Tc	1937	7
44	101.07	Ruthenium	Ru	1844	8
45	102.9055	Rhodium	Rh	1803	9
46	106.42	Palladium	Pd	1803	10
47	107.8682	Silver	Ag	Ancient	11
48	112.411	Cadmium	Cd	1817	12
49	114.818	Indium	In	1863	13
50	118.71	Tin	Sn	Ancient	14
51	121.76	Antimony	Sb	Ancient	15
52	127.6	Tellurium	Te	1783	16
53	126.9045	Iodine	I	1811	17
54	131.293	Xenon	Xe	1898	18
55	132.9055	Cesium	Cs	1860	1
56	137.327	Barium	Ba	1808	2
57	138.9055	Lanthanum	La	1839	3
58	140.116	Cerium	Ce	1803	101
59	140.9077	Praseodymium	Pr	1885	101
60	144.24	Neodymium	Nd	1885	101
61	145	Promethium	Pm	1945	101
62	150.36	Samarium	Sm	1879	101
63	151.964	Europium	Eu	1901	101
64	157.25	Gadolinium	Gd	1880	101
65	158.9253	Terbium	Tb	1843	101
66	162.5	Dysprosium	Dy	1886	101
67	164.9303	Holmium	Ho	1867	101
68	167.259	Erbium	Er	1842	101
69	168.9342	Thulium	Tm	1879	101
70	173.04	Ytterbium	Yb	1878	101
71	174.967	Lutetium	Lu	1907	101
72	178.49	Hafnium	Hf	1923	4
73	180.9479	Tantalum	Ta	1802	5
74	183.84	Tungsten	W	1783	6
75	186.207	Rhenium	Re	1925	7
76	190.23	Osmium	Os	1803	8
77	196.9665	Iridium	Ir	Ancient	11
78	192.217	Platinum	Pt	1803	9
79	195.078	Gold	Au	1735	10
80	200.59	Mercury	Hg	Ancient	12
81	204.3833	Thallium	Tl	1861	13
82	207.2	Lead	Pb	Ancient	14
83	208.9804	Bismuth	Bi	Ancient	15
84	209	Polonium	Po	1898	16
85	210	Astatine	At	1940	17
86	222	Radon	Rn	1900	18
87	223	Francium	Fr	1939	1
88	226	Radium	Ra	1898	2
89	227	Actinium	Ac	1899	3
90	232.0381	Thorium	Th	1829	102
91	231.0359	Protactinium	Pa	1913	102
92	238.0289	Uranium	U	1789	102
93	237	Neptunium	Np	1940	102
94	244	Plutonium	Pu	1940	102
95	243	Americium	Am	1944	102
96	247	Curium	Cm	1944	102
97	247	Berkelium	Bk	1949	102
98	251	Californium	Cf	1950	102
99	252	Einsteinium	Es	1952	102
100	257	Fermium	Fm	1952	102
101	258	Mendelevium	Md	1955	102
102	259	Nobelium	No	1958	102
103	262	Lawrencium	Lr	1961	102
104	261	Rutherfordium	Rf	1964	4
105	262	Dubnium	Db	1967	5
106	266	Seaborgium	Sg	1974	6
107	264	Bohrium	Bh	1981	7
108	277	Hassium	Hs	1984	8
109	268	Meitnerium	Mt	1982	9
110	261.9	Darmstadtium	Ds	1994	10
111	271.8	Roentgenium	Rg	1994	11
112	285	Copernicium	Cn	1996	12
113	286	Ununtrium	Uut	2003	13
114	289	Flerovium	Fl	1998	14
115	288	Ununpentium	Uup	2010	15
116	293	Livermorium	Lv	2000	16
117	260.9	Ununseptium	Uus	2010	17
118	294	Ununoctium	Uuo	2006	18

Atomic Number of Elements

There are about ninety elements found on Earth. Each one has a different number of protons, electrons and neutrons. The total number these subatomic particles held by the respective elements are responsible for their unique properties (including radioactivity).

The number of protons in the nucleus is called the atomic number. The atomic number of each element is unique. The combined number of protons and neutrons in an atom is called the atomic mass number. While the atomic number always stays the same some elements have atoms with different atomic mass numbers. This is because some elements have a different number of neutrons in the nucleus. Versions of an element with different atomic mass numbers are called isotopes.

Frequently Asked Questions – FAQs

What is atomic number?

The atomic number of an element is equal to the total number of protons in the nucleus of the atoms of that element. The atomic number can provide insight into the electronic configuration of the element. For example, carbon has an electron configuration of [He] 2s² 2p², since its atomic number is 6.

What is the atomic number and mass number?

The number of protons and the number of neutrons shall determine the mass number of an element. Since the isotopes of an element have slightly different mass numbers, it calculates the atomic mass by obtaining the mean of the mass numbers for its isotopes.

Can two different elements have the same atomic number?

Atoms from two different elements may have the same neutron count, but never the same proton count. The number of protons is unique to the element and it represents the number of atoms.

How do we calculate atomic mass?

Add the mass of protons and neutrons to compute the atomic mass of a single atom of an element. Example: Find the atomic mass of a carbon isotope which has 7 neutrons. From the periodic table you can see that carbon has an atomic number of 6, which is its proton number.

Why is atomic number important?

Atomic number is called the number of protons in an atom. This number is very important, because it is unique to a given element’s atoms. An element’s atoms all have the same number of protons and each element has a different number of protons in its atoms.

Periodic Table of Elements