Group → 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
IA IIA IIIB IVB VB VIB VIIB VIIIB VIIIB VIIIB IB IIB IIIA IVA VA VIA VIIA VIIIA
↓ Period
1 hydrogen
1.00794(7)
helium
4.002602(2)
2 lithium
6.941(2)
beryllium
9.012182(3)
boron
10.811(7)
carbon
12.0107(8)
nitrogen
14.00674(7)
oxygen
15.9994(3)
fluorine
18.9984032(5)
neon
20.1797(6)
3 sodium
22.98976928(2)
magnesium
24.3050(6)
aluminium
26.9815386(8)
silicon
28.0855(3)
phosphorus
30.973762(2)
sulfur
32.066(6)
chlorine
35.4527(9)
argon
39.948(1)
4 potassium
39.0983(1)
calcium
40.078(4)
scandium
44.955912(6)
titanium
47.867(1)
vanadium
50.9415(1)
chromium
51.9961(6)
manganese
54.938045(5)
iron
55.845(2)
cobalt
58.933195(5)
nickel
58.6934(2)
copper
63.546(3)
zinc
65.39(2)
gallium
69.723(1)
germanium
72.61(2)
arsenic
74.92160(2)
selenium
78.96(3)
bromine
79.904(1)
krypton
83.80(1)
5 rubidium
85.4678(3)
strontium
87.62(1)
yttrium
90585(2)
zirconium
91.224(2)
niobium
92.90638(2)
molybdenum
95.94(1)
technetium
[97.9072]
ruthenium
101.07(2)
rhodium
102.90550(2)
palladium
106.42(1)
silver
107.8682(2)
cadmium
112.411(8)
indium
114.818(3)
tin
118.710(7)
antimony
121.760(1)
tellurium
127.60(3)
iodine
126.90447(3)
xenon
131.29(2)
6 caesium
132.9054519(2)
barium
137.327(7)
57-71
*
Lanthanides
hafnium
178.49(2)
tantalum
180.94788(2)
tungsten
183.84(1)
rhenium
186.207(1)
osmium
190.23(3)
iridium
192.217(3)
platinum
195.084(9)
gold
196.966569(4)
mercury
200.59(2)
thallium
204.3833(2)
lead
207.2(1)
bismuth
208.98040(1)
polonium
[208.9824]
astatine
[209.9871]
radon
[222.0176]
7 francium
[223.0197]
radium
[226.0254]
89-103
**
Actinides
rutherfordium
104
Rf 
[263.1125]
dubnium
105
Db 
[262.1144]
seaborgium
106
Sg 
[266.1219]
bohrium
107
Bh 
[264.1247]
hassium
108
Hs 
[269.1341]
meitnerium
109
Mt 
[268.1388]
darmstadtium
110
Ds 
[272.1463]
roentgenium
111
Rg 
[272.1535]
ununbium
[277]
ununtrium
[284]
ununquadium
[289]
ununpentium
[288]
ununhexium
[292]
ununseptium
117
Uus

[291]
ununoctium
118
Uuo

[293]

Lanthanides   lanthanum
138.90547(7)
cerium
140.116(1)
praseodymium
140.90765(2)
neodymium
144.242(3)
promethium
[144.9127]
samarium
150.36(2)
europium
151.964(1)
gadolinium
157.25(3)
terbium
158.92535(2)
dysprosium
162.500(1)
holmium
164.93032(2)
erbium
167.259(3)
thulium
168.93421(2)
ytterbium
173.04(3)
lutetium
174.967(1)
** Actinides   actinium
[227.0277]
thorium
232.03806(2)
protactinium
231.03588(2)
uranium
238.02891(3)
neptunium
[237.0482]
plutonium
[244.0642]
americium
[243.0614]
curium
[247.0703]
berkelium
[247.0703]
californium
[251.0796]
einsteinium
[252.0830]
fermium
100
Fm 
[257.0951]
mendelevium
101
Md 
[258.0984]
nobelium
102
No 
[259.1011]
lawrencium
103
Lr 
[262.110]