Valencies of Some Elements in Periodic Table by SalmanFacts

Elements
Atomic No
At. Mass
Valency
Elements
At.No.
At.Mass
Valency
Hydrogen(H)
1
1
(+1)
Silicon(Si)
14
28
(+4)
Lithium(Li)
3
7
(+1)
Germanium(Ge)
32
73
(+4)
Sodim(Na)
11
23
(+1)
Tin(Sn)
50
119
(+4,+2)
Potassium(K)
19
39
(+1)
Lead(Pb)
82
207
(+4,+2)
Rubidium(Rb)
37
85
(+1)
Nitrogen(N)
7
14
(-3,+5)
Cesium(Cs)
55
133
(+1)
Phosphorus(P)
15
31
(+3,+5)
Francium(Fr)
87
223
(+1)
Arsenic(Ar)
33
75
(+3)
Beryllium(Be)
4
9
(+2)
Antimony(Sb)
51
122
(+3,+5)
Magnesium(Mg)
12
24
(+2)
Bismuth(Bi)
83
209
(+3)
Calcium(Ca)
20
40
(+2)
Oxygen(O)
8
16
(-2,-1,-1/2
Strontium(Sr)
38
88
(+2)
Sulphur(S)
16
32
(2,4,6)
Barium(Ba)
56
137
(+2)
Selenium(Se)
34
79
(-2)
Radium(Ra)
88
226
(+2)
Tellurium(Te)
52
127.6
(-2)
`Boron(B)
5
11
(+3,-5}
Flourine(F)
9
19
(-1)
Aluminium(Al)
13
27
(+3)
Chlorine(Cl)
17
35
(-1)
Gallium(Ga)
31
70
(-3)
Bromine(Br)
35
80
(-1)
Indium(In)
49
115
(-3)
Iodine(I)
53
127
(-1)
Thallium(Tl)
81
205
(-3)
Astatine(At)
85
210
(-1)
Carbon©
6
12
(+4)

Some More About Elements
Lithium [Li]``CAS-ID: 7439-93-2``An: 3 N: 4``Am: [6.941 (2)] g/mol``Group No: 1``Group Name: Alkali metal``Block: s-block``Period: 2``State: solid at 298 K ``Colour: silvery white/grey``Classification: Metallic``Boiling Point: 1615K (1342°C)``Melting Point: 453.69K (180.54°C)``Critical temperature: 3223K (2950°C)``Density: 0.534g/cm3``Discovery Information
Who: Johann Arfvedson``When: 1817 Where: Sweden``Name Origin Greek: lithos (stone). "Lithium" in different languages.``Sources Lithium is widely distributed but does not occur in nature in its free form. Because of its reactivity, it is always found bound with one or more other elements or compounds. Found in trace amounts in the minerals; spodumene (LiAl(SiO3)2), amblygonite (Li,Na)AlPO4(F,OH)), lepidolite (KLi2Al(Al,Si)3O10(F,OH)2). Most commercial lithium is recovered from brines sources