Elements With Their Atomic Number

• Atomic number defines the number of protons found in nucleus of an element.
• The total number of protons and neutrons (found in nucleus) is calculated as the atomic mass number.
• The following table illustrates the some of the significant elements with their atomic number, atomic mass, and symbols −

Element	Atomic Number	Atomic Mass (g mol-1)	Symbol
Hydrogen	1	1.0079	H
Helium	2	4.00	He
Lithium	3	6.94	Li
Beryllium	4	9.01	Be
Boron	5	10.81	B
Carbon	6	12.01	C
Nitrogen	7	14.0067	N
Oxygen	8	16.00	O
Fluorine	9	19.00	F
Neon	10	20.1797	Ne
Sodium	11	22.989768	Na
Magnesium	12	24.3050	Mg
Aluminum	13	26.981539	Al
Silicon	14	28.0855	Si
Phosphorus	15	30.973762	P
Sulfur	16	32.066	S
Chlorine	17	35.4527	Cl
Argon	18	39.948	Ar
Potassium	19	39.0983	K
Calcium	20	40.078	Ca
Scandlum	21	44.955910	Sc
Titanium	22	47.867	Ti
Vanadium	23	50.9415	V
Chromium	24	51.9961	Cr
Manganese	25	54.93805	Mn
Iron	26	55.845	Fe
Cobalt	27	58.93320	Co
Nickel	28	58.6934	Ni
Copper	29	63.546	Cu
Zinc	30	65.39	Zn
Gallium	31	69.723	Ga
Germanium	32	72.61	Ge
Arsenic	33	74.92159	As
Selenium	34	78.96	Se
Bromine	35	79.904	Br
Krypton	36	83.80	Kr
Rubidium	37	85.4678	Rb
Strontium	38	87.62	Sr
Yttrium	39	88.90585	Y
Zirconium	40	91.224	Zr
Niobium	41	92.90638	Nb
Molybdenum	42	95.94	Mo
Technetium	43	97.9072	Te
Ruthenium	44	101.07	Ru
Rhodium	45	102.90550	Rh
Palladium	46	106.42	Pd
Silver	47	107.8682	Ag
Cadmium	48	112.411	Cd
Indium	49	114.818	In
Tin	50	118.710	Sn
Antimony	51	121.760	Sb
Tellurium	52	127.60	Te
Iodine	53	126.90447	I
Xenon	54	131.29	Xe
Cesium	55	132.90543	Cs
Barium	56	137.327	Ba
Lanthanum	57	138.9055	La
Cerium	58	140.115	Ce
Praseodymium	59	140.90765	Pr
Neodymium	60	144.24	Nd
Promethium	61	144.9127	Pm
Samarium	62	150.36	Sm
Europium	63	151.965	Eu
Gadolinium	64	157.25	Gd
Terbium	65	158.92534	Tb
Dysprosium	66	162.50	Dy
Holmium	67	164.93032	Ho
Erbium	68	167.26	Er
Thulium	69	168.93421	Tm
Ytterbium	70	173.04	Yb
Lutetium	71	174.967	Lu
Hafnium	72	178.49	Hf
Tantalum	73	180.9479	Ta
Tungsten	74	183.84	W
Rhenium	75	186.207	Re
Osmium	76	190.23	Os
Iridium	77	192.217	Ir
Platinum	78	195.08	Pt
Gold	79	196.96654	Au
Mercury	80	200.59	Hg
Thallium	81	204.3833	Tl
Lead	82	207.2	Pb
Bismuth	83	208.98037	Bi
Polonium	84	208.9824	Po
Astatine	85	209.9871	At
Radon	86	222.0176	Rn
Francium	87	223.0197	Fr
Radium	88	226.0254	Ra
Actinium	89	227.0278	Ac
Thorium	90	232.0381	Th
Protactinium	91	231.0388	Pa
Uranium	92	238.0289	U
Neptunium	93	237.0482	Np
Plutonium	94	244.0642	Pu
Americium	95	243.0614	Am
Curium	96	247.0703	Cm
Berkelium	97	247.0703	Bk
Californium	98	251.0796	Cf
Einsteinium	99	252.083	Es
Fermium	100	257.0951	Fm
Mendelevium	101	258.10	Md
Nobelium	102	259.1009	No
Lawrencium	103	262.11	Lr
Unnilquadium	104	261.11	Unq
Unnilpentium	105	262.114	Unp
Unnilhexium	106	263.118*	Unh
Unnilseptium	107	262.12	Uns