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Chemistry

Chemistry is certainly a complex and insanely interesting science. It is quite difficult to describe the practical benefits of knowledge of chemistry, since chemical reactions take place endlessly in us, as well as around us. Understanding such processes will answer many questions: why can't drinking water be left in the sun? why is there no cure for all diseases? how does the current flow? after all, why do we salt porridge if it doesn't get salty?

2. Inorganic chemistry

4. Applied Chemistry

3. Organic Chemistry

1. General chemistry

Periodic Table

s
p
d
f
1
18
 
1
 
1
H
1.008
2
13
14
15
16
17
2
He
4.003
 
2
 
3
Li
6.938
4
Be
9.012
5
B
10.806
6
C
12.01
7
N
14.006
8
O
15.999
9
F
18.998
10
Ne
20.18
 
3
 
11
Na
22.99
12
Mg
24.304
3
4
5
6
7
8
9
10
11
12
13
Al
26.982
14
Si
28.084
15
P
30.974
16
S
32.059
17
Cl
35.446
18
Ar
39.948
 
4
 
19
K
39.098
20
Ca
40.078
21
Sc
44.956
22
Ti
47.867
23
V
50.942
24
Cr
51.996
25
Mn
54.938
26
Fe
55.845
27
Co
58.933
28
Ni
58.693
29
Cu
63.546
30
Zn
65.38
31
Ga
69.723
32
Ge
72.63
33
As
74.922
34
Se
78.971
35
Br
79.901
36
Kr
83.798
 
5
 
37
Rb
85.468
38
Sr
87.62
39
Y
88.906
40
Zr
91.224
41
Nb
92.906
42
Mo
95.95
43
Tc
0
44
Ru
101.07
45
Rh
102.906
46
Pd
106.42
47
Ag
107.868
48
Cd
112.414
49
In
114.818
50
Sn
118.71
51
Sb
121.76
52
Te
127.6
53
I
126.904
54
Xe
131.293
 
6
 
55
Cs
132.905
56
Ba
137.327
57
La
138.905
﹡
72
Hf
178.49
73
Ta
180.948
74
W
183.84
75
Re
186.207
76
Os
190.23
77
Ir
192.217
78
Pt
195.084
79
Au
196.967
80
Hg
200.592
81
Tl
204.382
82
Pb
207.2
83
Bi
208.98
84
Po
0
85
At
0
86
Rn
0
 
7
 
87
Fr
0
88
Ra
0
89
Ac
0
﹡
104
Rf
0
105
Db
0
106
Sg
0
107
Bh
0
108
Hs
0
109
Mt
0
110
Ds
0
111
Rg
0
112
Cn
0
113
Nh
0
114
Fl
0
115
Mc
0
116
Lv
0
117
Ts
0
118
Og
0
 
﹡6﹡
 
58
Ce
140.116
59
Pr
140.908
60
Nd
144.242
61
Pm
0
62
Sm
150.36
63
Eu
151.964
64
Gd
157.25
65
Tb
158.925
66
Dy
162.5
67
Ho
164.93
68
Er
167.259
69
Tm
168.934
70
Yb
173.045
71
Lu
174.967
 
﹡7﹡
 
90
Th
232.038
91
Pa
231.036
92
U
238.029
93
Np
0
94
Pu
0
95
Am
0
96
Cm
0
97
Bk
0
98
Cf
0
99
Es
0
100
Fm
0
101
Md
0
102
No
0
103
Lr
0

In the periodic table, columns are called groups, rows are called periods. The elements in the groups, as a rule, have the same electronic configurations of the outer shells, for example, noble gases - the last group, have a complete electronic configuration.

How the electronic configuration of the elements is filled in is described in detail in the article

Download the periodic table in high quality