Àkójọ àmì-ìdámọ̀ àwon apilẹ̀sẹ̀

Current symbols

Symbol	Name	Etymology of symbol	Atomic number	Relative atomic mass	Group	Period
Ac	Actinium	from Greek aktinos	89	&227[227]^[1]		7
Ag	Silver	Latin argentum	47	&107.86822107.8682(2)^[2]	11	5
Al	Aluminium (Aluminum)	Latin alumen	13	&026.9815386826.9815386(8)	13	3
Am	Americium	the Americas	95	&243[243]^[1]		7
Ar	Argon	Greek argon	18	&039.948139.948(1)^[2]^[3]	18	3
As	Arsenic	Greek arsenikos	33	&074.92160274.92160(2)	15	4
At	Astatine	Greek astatos	85	&210[210]^[1]	17	6
Au	Gold	Latin aurum	79	&196.9665694196.966569(4)	11	6
B	Boron	borax	5	&010.811710.811(7)^[2]^[3]^[4]	13	2
Ba	Barium	Greek barys	56	&137.3277137.327(7)	2	6
Be	Beryllium	beryl	4	&009.01218239.012182(3)	2	2
Bh	Bohrium	Niels Bohr	107	&264[264]^[1]	7	7
Bi	Bismuth	from German wissmuth	83	&208.980401208.98040(1)	15	6
Bk	Berkelium	Berkeley, California	97	&247[247]^[1]		7
Br	Bromine	Greek bromos	35	&079.904179.904(1)	17	4
C	Carbon	Latin carbo	6	&012.0107812.0107(8)^[2]^[3]	14	2
Ca	Calcium	Latin calx	20	&040.078440.078(4)^[2]	2	4
Cd	Cadmium	from Greek kadmia	48	&112.4118112.411(8)^[2]	12	5
Ce	Cerium	Ceres	58	&140.1161140.116(1)^[2]		6
Cf	Californium	State and University of California	98	&251[251]^[1]		7
Cl	Chlorine	Greek chloros	17	&035.453235.453(2)^[2]^[3]^[4]	17	3
Cm	Curium	Pierre and Marie Curie and the traditional -um ending	96	&247[247]^[1]		7
Cn	Copernicium	Nicolaus Copernicus	112	&285[285]^[1]	12	7
Co	Cobalt	from German kobold	27	&058.933195558.933195(5)	9	4
Cr	Chromium	Greek chroma	24	&051.9961651.9961(6)	6	4
Cs	Caesium (Cesium)	Latin caesius	55	&132.90545192132.9054519(2)	1	6
Cu	Copper	Latin Cuprum	29	&063.546363.546(3)^[3]	11	4
Db	Dubnium	Dubna, Russia	105	&262[262]^[1]	5	7
Ds	Darmstadtium	Darmstadt, Germany	110	&271[271]^[1]	10	7
Dy	Dysprosium	Greek dysprositos	66	&162.5001162.500(1)^[2]		6
Er	Erbium	Ytterby, Sweden	68	&167.2593167.259(3)^[2]		6
Es	Einsteinium	Albert Einstein	99	&252[252]^[1]		7
Eu	Europium	Europe	63	&151.9641151.964(1)^[2]		6
F	Fluorine	Latin fluo	9	&018.9984032518.9984032(5)	17	2
Fe	Iron	Latin ferrum	26	&055.845255.845(2)	8	4
Fm	Fermium	Enrico Fermi	100	&257[257]^[1]		7
Fr	Francium	France	87	&223[223]^[1]	1	7
Ga	Gallium	Latin Gallia	31	&069.723169.723(1)	13	4
Gd	Gadolinium	gadolinite	64	&157.253157.25(3)^[2]		6
Ge	Germanium	Germany	32	&072.64172.64(1)	14	4
H	Hydrogen	Greek hydrogenes	1	&001.0079471.00794(7)^[2]^[3]^[4]	1	1
He	Helium	Greek helios	2	&004.00260224.002602(2)^[2]^[3]	18	1
Hf	Hafnium	Latin Hafnia	72	&178.492178.49(2)	4	6
Hg	Mercury	Latin hydrargyrum	80	&200.592200.59(2)	12	6
Ho	Holmium	Latin Holmia	67	&164.930322164.930 32(2)		6
Hs	Hassium	Hesse, Germany	108	&277[277]^[1]	8	7
I	Iodine	Greek ioeides	53	&126.904473126.904 47(3)	17	5
In	Indium	indigo blue	49	&114.8183114.818(3)	13	5
Ir	Iridium	Greek iris	77	&192.2173192.217(3)	9	6
K	Potassium (Kalium)	Latin kalium	19	&039.0983139.0983(1)	1	4
Kr	Krypton	Greek kryptos	36	&083.798283.798(2)^[2]^[4]	18	4
La	Lanthanum	Greek lanthanien	57	&138.905477138.90547(7)^[2]		6
Li	Lithium	Greek lithos	3	&006.94126.941(2)^[2]^[3]^[4]^[5]	1	2
Lr	Lawrencium	Ernest O. Lawrence	103	&262[262]^[1]	3	7
Lu	Lutetium	Latin Lutetia	71	&174.9671174.967(1)^[2]	3	6
Md	Mendelevium	Dmitri Mendeleyev	101	&258[258]^[1]		7
Mg	Magnesium	Magnesia, Greece	12	&024.3050624.3050(6)	2	3
Mn	Manganese	Latin magnes	25	&054.938045554.938045(5)	7	4
Mo	Molybdenum	Greek molybdos	42	&095.94295.94(2)^[2]	6	5
Mt	Meitnerium	Lise Meitner	109	&268[268]^[1]	9	7
N	Nitrogen	Greek nitron	7	&014.0067214.0067(2)^[2]^[3]	15	2
Na	Sodium	Latin natrium	11	&022.98976928222.98976928(2)	1	3
Nb	Niobium	Niobe	41	&092.90638292.906 38(2)	5	5
Nd	Neodymium	Greek neos didymos	60	&144.2423144.242(3)^[2]		6
Ne	Neon	Greek neos	10	&020.1797620.1797(6)^[2]^[4]	18	2
Ni	Nickel	German kupfernickel	28	&058.6934258.6934(2)	10	4
No	Nobelium	Alfred Nobel	102	&259[259]^[1]		7
Np	Neptunium	Neptune	93	&237[237]^[1]		7
O	Oxygen	Greek oxys	8	&015.9994315.9994(3)^[2]^[3]	16	2
Os	Osmium	Greek osme	76	&190.233190.23(3)^[2]	8	6
P	Phosphorus	Greek phosphoros	15	&030.973762230.973762(2)	15	3
Pa	Protactinium	Greek protos and actinium	91	&231.035882231.03588(2)^[1]		7
Pb	Lead	Latin plumbum	82	&207.21207.2(1)^[2]^[3]	14	6
Pd	Palladium	Pallas (genitive Pallados)	46	&106.421106.42(1)^[2]	10	5
Pm	Promethium	Prometheus	61	&145[145]^[1]		6
Po	Polonium	Poland	84	&210[210]^[1]	16	6
Pr	Praseodymium	Greek prasios	59	&140.907652140.90765(2)		6
Pt	Platinum	Greek platina	78	&195.0849195.084(9)	10	6
Pu	Plutonium	Pluto	94	&244[244]^[1]		7
Ra	Radium	Latin radius	88	&226[226]^[1]	2	7
Rb	Rubidium	Latin rubidus	37	&085.4678385.4678(3)^[2]	1	5
Re	Rhenium	German Rheinprovinz	75	&186.2071186.207(1)	7	6
Rf	Rutherfordium	Ernest Rutherford	104	&261261^[1]	4	7
Rg	Roentgenium	Wilhelm Conrad Röntgen	111	&272[272]^[1]	11	7
Rh	Rhodium	Greek rhodon	45	&102.905502102.905 50(2)	9	5
Rn	Radon	radium and emanation	86	&220[220]^[1]	18	6
Ru	Ruthenium	Latin Ruthenia	44	&101.072101.07(2)^[2]	8	5
S	Sulfur (Sulphur)	Latin sulfur	16	&032.065532.065(5)^[2]^[3]	16	3
Sb	Antimony	Latin stibium	51	&121.7601121.760(1)^[2]	15	5
Sc	Scandium	Scandinavia	21	&044.955912644.955912(6)	3	4
Se	Selenium	Greek selene	34	&078.96378.96(3)^[3]	16	4
Sg	Seaborgium	Glenn T. Seaborg	106	&266[266]^[1]	6	7
Si	Silicon	Latin silex	14	&028.0855328.0855(3)^[3]	14	3
Sm	Samarium	samarskite	62	&150.362150.36(2)^[2]		6
Sn	Tin	Latin stannum	50	&118.7101118.710(7)^[2]	14	5
Sr	Strontium	Gaelic Strontian	38	&087.62187.62(1)^[2]^[3]	2	5
Ta	Tantalum	King Tantalus	73	&180.947882180.94788(2)	5	6
Tb	Terbium	Ytterby, Sweden	65	&158.925352158.92535(2)		6
Tc	Technetium	Greek technetos	43	&098[98]^[1]	7	5
Te	Tellurium	Greek tellus	52	&127.603127.60(3)^[2]	16	5
Th	Thorium	Thor	90	&232.038062232.03806(2)^[1]^[2]		7
Ti	Titanium	the Titans	22	&047.867147.867(1)	4	4
Tl	Thallium	Greek thallos	81	&204.38332204.3833(2)	13	6
Tm	Thulium	Thule and the traditional -ium ending	69	&168.934212168.93421(2)		6
U	Uranium	Uranus	92	&238.028913238.02891(3)^[1]^[2]^[4]		7
Uuh	Ununhexium	Latin uni, uni, and Greek hex	116	&292[292]^[1]	16	7
Uuo	Ununoctium	Latin uni, uni, and oct	118	&294[294]^[1]	18	7
Uup	Ununpentium	Latin uni, uni, and Greek pent	115	&288[288]^[1]	15	7
Uuq	Ununquadium	Latin uni, uni, and quadr	114	&289[289]^[1]	14	7
Uus	Ununseptium	Latin uni, uni, and Greek sept	117	&295[295]^[1]	17	7
Uut	Ununtrium	Latin uni, uni, and Greek tri	113	&284[284]^[1]	13	7
V	Vanadium	Vanadis	23	&050.9415150.9415(1)	5	4
W	Tungsten	German wolfram	74	&183.841183.84(1)	6	6
Xe	Xenon	Greek xenos	54	&131.2936131.293(6)^[2]^[4]	18	5
Y	Yttrium	Ytterby, Sweden	39	&088.90585288.90585(2)	3	5
Yb	Ytterbium	Ytterby, Sweden	70	&173.043173.04(3)^[2]		6
Zn	Zinc	German zink	30	&065.409465.409(4)	12	4
Zr	Zirconium	zircon	40	&091.224291.224(2)^[2]	4	5

Some element categories in the periodic table

Metals						Metalloids	Nonmetals			Unknown chemical properties
Alkali metals	Alkaline earth metals	Inner transition metals		Transition metals	Post-transition metals		Other nonmetals	Halogens	Noble gases
		Lanthanides	Actinides

Itokasi

↑ ^1.00 ^1.01 ^1.02 ^1.03 ^1.04 ^1.05 ^1.06 ^1.07 ^1.08 ^1.09 ^1.10 ^1.11 ^1.12 ^1.13 ^1.14 ^1.15 ^1.16 ^1.17 ^1.18 ^1.19 ^1.20 ^1.21 ^1.22 ^1.23 ^1.24 ^1.25 ^1.26 ^1.27 ^1.28 ^1.29 ^1.30 ^1.31 ^1.32 ^1.33 ^1.34 ^1.35 ^1.36 The element does not have any stable nuclides, and a value in brackets, e.g. [209], indicates the mass number of the longest-lived isotope of the element. However, three elements, thorium, protactinium, and uranium, have a characteristic terrestrial isotopic composition, and thus their atomic mass given.
↑ ^2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 ^2.11 ^2.12 ^2.13 ^2.14 ^2.15 ^2.16 ^2.17 ^2.18 ^2.19 ^2.20 ^2.21 ^2.22 ^2.23 ^2.24 ^2.25 ^2.26 ^2.27 ^2.28 ^2.29 ^2.30 ^2.31 ^2.32 ^2.33 ^2.34 ^2.35 ^2.36 ^2.37 ^2.38 The isotopic composition of this element varies in some geological specimens, and the variation may exceed the uncertainty stated in the table.
↑ ^3.00 ^3.01 ^3.02 ^3.03 ^3.04 ^3.05 ^3.06 ^3.07 ^3.08 ^3.09 ^3.10 ^3.11 ^3.12 ^3.13 ^3.14 The isotopic composition varies in terrestrial material such that a more precise atomic weight can not be given.
↑ ^4.0 ^4.1 ^4.2 ^4.3 ^4.4 ^4.5 ^4.6 ^4.7 The isotopic composition of the element can vary in commercial materials, which can cause the atomic weight to deviate significantly from the given value.
↑ The atomic weight of commercial Lithium can vary between 6.939 and 6.996—analysis of the specific material is necessary to find a more accurate value.

[fn_1-1] 1.00 ^1.01 ^1.02 ^1.03 ^1.04 ^1.05 ^1.06 ^1.07 ^1.08 ^1.09 ^1.10 ^1.11 ^1.12 ^1.13 ^1.14 ^1.15 ^1.16 ^1.17 ^1.18 ^1.19 ^1.20 ^1.21 ^1.22 ^1.23 ^1.24 ^1.25 ^1.26 ^1.27 ^1.28 ^1.29 ^1.30 ^1.31 ^1.32 ^1.33 ^1.34 ^1.35 ^1.36 The element does not have any stable nuclides, and a value in brackets, e.g. [209], indicates the mass number of the longest-lived isotope of the element. However, three elements, thorium, protactinium, and uranium, have a characteristic terrestrial isotopic composition, and thus their atomic mass given.

[fn_2-2] 2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 ^2.11 ^2.12 ^2.13 ^2.14 ^2.15 ^2.16 ^2.17 ^2.18 ^2.19 ^2.20 ^2.21 ^2.22 ^2.23 ^2.24 ^2.25 ^2.26 ^2.27 ^2.28 ^2.29 ^2.30 ^2.31 ^2.32 ^2.33 ^2.34 ^2.35 ^2.36 ^2.37 ^2.38 The isotopic composition of this element varies in some geological specimens, and the variation may exceed the uncertainty stated in the table.

[fn_4-3] 3.00 ^3.01 ^3.02 ^3.03 ^3.04 ^3.05 ^3.06 ^3.07 ^3.08 ^3.09 ^3.10 ^3.11 ^3.12 ^3.13 ^3.14 The isotopic composition varies in terrestrial material such that a more precise atomic weight can not be given.

[fn_3-4] 4.0 ^4.1 ^4.2 ^4.3 ^4.4 ^4.5 ^4.6 ^4.7 The isotopic composition of the element can vary in commercial materials, which can cause the atomic weight to deviate significantly from the given value.

[5] The atomic weight of commercial Lithium can vary between 6.939 and 6.996—analysis of the specific material is necessary to find a more accurate value.

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