Besides physics, chemistry is one of the compulsory subjects at school and in the first years of many university courses. Chemistry problems give many schoolchildren and students trouble, and Mendeleev's periodic table of the elements is of invaluable help in solving them.
| I | II | III | IV | V | IV | VII | VIII | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| I |
1
H
1.00795
hydrogen
|
2
He
4.002602
helium
|
|||||||||
| II |
3
Li
6.941
lithium
|
4
Be
9.01218
beryllium
|
5
B
10.811
boron
|
6
C
12.011
carbon
|
7
N
14.0067
nitrogen
|
8
O
15.9994
oxygen
|
9
F
18.9984
fluorine
|
10
Ne
20.179
neon
|
|||
| III |
11
Na
22.9897
sodium
|
12
Mg
24.305
magnesium
|
13
Al
26.9815
aluminium
|
14
Si
28.0855
silicon
|
15
P
30.9737
phosphorus
|
16
S
32.066
sulfur
|
17
Cl
35.453
chlorine
|
18
Ar
39.948
argon
|
|||
| IV |
19
K
39.0983
potassium
|
20
Ca
40.078
calcium
|
21
Sc
44.9559
scandium
|
22
Ti
47.88
titanium
|
23
V
50.9415
vanadium
|
24
Cr
51.9961
chromium
|
25
Mn
54.9380
manganese
|
26
Fe
55.847
iron
|
27
Co
58.9332
cobalt
|
28
Ni
58.69
nickel
|
|
|
29
Cu
63.546
copper
|
30
Zn
65.39
zinc
|
31
Ga
69.723
gallium
|
32
Ge
72.59
germanium
|
33
As
74.9216
arsenic
|
34
Se
78.96
selenium
|
35
Br
79.904
bromine
|
36
Kr
83.80
krypton
|
||||
| V |
37
Rb
85.4678
rubidium
|
38
Sr
87.62
strontium
|
39
Y
88.9059
yttrium
|
40
Zr
91.224
zirconium
|
41
Nb
92.9064
niobium
|
42
Mo
95.94
molybdenum
|
43
Tc
97.9072
technetium
|
44
Ru
101.07
ruthenium
|
45
Rh
102.905
rhodium
|
46
Pd
106.42
palladium
|
|
|
47
Ag
107.868
silver
|
48
Cd
112.41
cadmium
|
49
In
114.82
indium
|
50
Sn
118.710
tin
|
51
Sb
121.75
antimony
|
52
Te
127.60
tellurium
|
53
I
126.904
iodine
|
54
Xe
131.29
xenon
|
||||
| VI |
55
Cs
132.905
caesium
|
56
Ba
137.33
barium
|
72
Hf
178.49
hafnium
|
73
Ta
180.947
tantalum
|
74
W
183.85
tungsten
|
75
Re
186.207
rhenium
|
76
Os
190.2
osmium
|
77
Ir
192.22
iridium
|
78
Pt
195.08
platinum
|
||
|
79
Au
196.966
gold
|
80
Hg
200.59
mercury
|
81
Tl
204.383
thallium
|
82
Pb
207.2
lead
|
83
Bi
208.980
bismuth
|
84
Po
208.982
polonium
|
85
At
209.987
astatine
|
86
Rn
222.017
radon
|
||||
| VII |
87
Fr
223.019
francium
|
88
Ra
226.025
radium
|
0
Rf
|
0
Db
|
0
Sg
|
0
Bh
|
0
Hs
|
0
Mt
|
|||
| * lanthanides (Mendeleev's table) | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
57
La
138.905
lanthanum
|
58
Ce
140.12
cerium
|
59
Pr
140.90
praseodymium
|
60
Nd
144.24
neodymium
|
61
Pm
144.9128
promethium
|
62
Sm
150.36
samarium
|
63
Eu
151.96
europium
|
64
Gd
157.25
gadolinium
|
65
Tb
158.925
terbium
|
66
Dy
162.50
dysprosium
|
67
Ho
164.930
holmium
|
68
Er
167.26
erbium
|
69
Tm
168.934
thulium
|
70
Yb
173.04
ytterbium
|
71
Lu
174.967
lutetium
|
| ** actinides (Mendeleev's table) | ||||||||||||||
|
89
Ac
227.027
actinium
|
90
Th
232.038
thorium
|
91
Pa
231.0359
protactinium
|
92
U
238.028
uranium
|
93
Np
237.0482
neptunium
|
94
Pu
244.0642
plutonium
|
95
Am
243.0614
americium
|
96
Sm
247.0703
curium
|
97
Bk
247.0703
berkelium
|
98
Cf
251.0796
californium
|
99
Es
252.0828
einsteinium
|
100
Fm
257.0951
fermium
|
101
Md
258.0986
mendelevium
|
102
No
259.1009
nobelium
|
103
Lr
260.1054
lawrencium
|