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Potassium-2

Potassium pearls under paraffin oil. The large pearl measures 0.5 cm.

Potassium
Potassium
Identification
Symbol
K
Block
s-block
Group
Group 1
Period
Period 4
Atomic Information
Atomic Number
19
Atomic Radius
227 pm
Mass
39.09
Category
Standard state(298 K)
Solid
Electronic Configuration
[Ar]4s1
Electronegativity (Pauling)
Unknown
Unknown
First ionisation energy
Unknown
Physical Properties
Color
Silvery-White
Melting Point
336.7 K
Boiling Point
1032 K
Density of solid
Unknown
Unknown
Heat Properties
Enthalpy of fusion
Unknown
Enthalpy of atomisation
Unknown
Enthalpy of vaporisation
Unknown


Potassium is the 19th element in the periodic table according to its atomic number. It belongs to the Alkali metal's category and is highly reactive. Elemental potassium is soft, silver-white and oxidizes rapidly in air and is very reactive with water, which generates sufficient heat to ignite the hydrogen produced in the reaction(causing further heavy reaction). It burns with a Lilac coloured flame. Due to its high reactivity , potassium is usually kept stored in parrafin /kerosene oil. 


Discovery

The text in this section is similar to a Wikipedia article but revised.

The English name for the element potassium comes from the word "potash" which refers to the plant ashes. Potash primarily consists of Potassium as plant ashes have almost no sodium content. While potash has been used since ancient times, it was not understood for most of its history to be a fundamentally different substance from sodium mineral salts. Georg Ernst Stahl obtained experimental evidence that led him to suggest the fundamental difference of sodium and potassium salts in 1702, and Henri Louis Duhamel du Monceau was able to prove this difference in 1736. The exact chemical composition of potassium and sodium compounds, and the status as chemical element of potassium and sodium, was not known then. Potassium metal was first isolated in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH) by the use of electrolysis of the molten salt with the newly discovered voltaic pile. Potassium was the first metal that was isolated by electrolysis.














Periodic Table

1
H
2
He
3
Li
4
Be
5
B
6
C
7
N
8
O
9
F
10
Ne
11
Na
12
Mg
13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
19
K
20
Ca
21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
31
Ga
32
Ge
33
As
34
Se
35
Br
36
Kr
37
Rb
38
Sr
39
Y
40
Zr
41
Nb
42
Mo
43
Tc
44
Ru
45
Rh
46
Pd
47
Ag
48
Cd
49
In
50
Sn
51
Sb
52
Te
53
I
54
Xe
55
Cs
56
Ba
* 72
Hf
73
Ta
74
W
75
Re
76
Os
77
Ir
78
Pt
79
Au
80
Hg
81
Tl
82
Pb
83
Bi
84
Po
85
At
86
Rn
87
Fr
88
Ra
** 104
Rf
105
Db
106
Sg
107
Bh
108
Hs
109
Mt
110
Ds
111
Rg
112
Cn
113
Uut
114
Fl
115
Uup
116
Lv
117
Uus
118
Uuo


* 57
La
58
Ce
59
Pr
60
Nd
61
Pm
62
Sm
63
Eu
64
Gd
65
Tb
66
Dy
67
Ho
68
Er
69
Tm
70
Yb
71
Lu
** 89
Ac
90
Th
91
Pa
92
U
93
Np
94
Pu
95
Am
96
Cm
97
Bk
98
Cf
99
Es
100
Fm
101
Md
102
No
103
Lr

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