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Atomic Masses Quiz

Name the atomic masses of all the elements (to 3 d.p.)

Note: numbers are rounded in the answers, but type-ins to 4 d.p. are also accepted.

Red highlighting indicates the atomic mass going down.

Atomic Masses are from Wikipedia, but many of them have margins of error, so more than one answer may be accepted.

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Last updated: March 7, 2025

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First submitted	March 6, 2025
Times taken	434
Average score	11.9%
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Element	Mass (amu)
H Hydrogen	1.008
He Helium	4.003
Li Lithium	6.941
Be Beryllium	9.012
B Boron	10.811
C Carbon	12.011
N Nitrogen	14.007
O Oxygen	15.999
F Fluorine	18.998
Ne Neon	20.180
Na Sodium	22.990
Mg Magnesium	24.305
Al Aluminium	26.982
Si Silicon	28.085
P Phosphorus	30.974
S Sulfur	32.065
Cl Chlorine	35.453
Ar Argon	39.948
K Potassium	39.098
Ca Calcium	40.078
Sc Scandium	44.956
Ti Titanium	47.867
V Vanadium	50.942
Cr Chromium	51.996
Mn Manganese	54.938
Fe Iron	55.845
Co Cobalt	58.933
Ni Nickel	58.693
Cu Copper	63.546
Zn Zinc	65.38
Ga Gallium	69.723
Ge Germanium	72.64
As Arsenic	74.922
Se Selenium	78.971
Br Bromine	79.904
Kr Krypton	83.798
Rb Rubidium	85.468
Sr Strontium	87.62
Y Yttrium	88.906
Zr Zirconium	91.224

Element	Mass (amu)
Nb Niobium	92.906
Mo Molybdenum	95.95
Tc Technetium	(97)
Ru Ruthenium	101.07
Rh Rhodium	102.906
Pd Palladium	106.42
Ag Silver	107.868
Cd Cadmium	112.414
In Indium	114.818
Sn Tin	118.71
Sb Antimony	121.76
Te Tellurium	127.60
I Iodine	126.904
Xe Xenon	131.293
Cs Caesium	132.905
Ba Barium	137.327
La Lanthanum	138.905
Ce Cerium	140.116
Pr Praseodymium	140.908
Nd Neodymium	144.242
Pm Promethium	(145)
Sm Samarium	150.36
Eu Europium	151.964
Gd Gadolinium	157.249
Tb Terbium	158.925
Dy Dysprosium	162.50
Ho Holmium	164.930
Er Erbium	167.259
Tm Thulium	168.934
Yb Ytterbium	173.045
Lu Lutetium	174.967
Hf Hafnium	178.486
Ta Tantalum	180.948
W Tungsten	183.84
Re Rhenium	186.207
Os Osmium	190.23
Ir Iridium	192.217
Pt Platinum	195.084
Au Gold	196.967

Element	Mass (amu)
Hg Mercury	200.592
Tl Thallium	204.383
Pb Lead	207.2
Bi Bismuth	208.980
Po Polonium	(209)
At Astatine	(210)
Rn Radon	(222)
Fr Francium	(223)
Ra Radium	(226)
Ac Actinium	(227)
Th Thorium	232.038
Pa Protactinium	231.036
U Uranium	238.029
Np Neptunium	(237)
Pu Plutonium	(244)
Am Americium	(243)
Cm Curium	(247)
Bk Berkelium	(247)
Cf Californium	(251)
Es Einsteinium	(252)
Fm Fermium	(257)
Md Mendelevium	(258)
No Nobelium	(259)
Lr Lawrencium	(266)
Rf Rutherfordium	(267)
Db Dubnium	(268)
Sg Seaborgium	(267)
Bh Bohrium	(270)
Hs Hassium	(271)
Mt Meitnerium	(278)
Ds Darmstadtium	(281)
Rg Roentgenium	(282)
Cn Copernicium	(285)
Nh Nihonium	(286)
Fl Flerovium	(289)
Mc Moscovium	(290)
Lv Livermorium	(293)
Ts Tennessine	(294)
Og Oganesson	(294)

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1 Comments

+1

Level 27

Oct 9, 2025

Love how nobody even tried to guess Antimony to Tennesine

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