potassium in oil

K - Potassium

In 1807, Humphrey Davy electrolyzed "fused potash" (KOH) to form pure potassium at the cathode. Potassium, also known as kalium, is a soft alkali metal and one of the most active metals known. Our students encounter reactions of potassium with water and work with several potassium compounds.

Atomic number - 19 Density g/mL 0 .86

Atomic weight u 39 .0983 Melting point K 336 .35

Bonding radius A 2 .03 Boiling point K 1032

Atomic radius A 2 .77 Heat of vaporization kJ/mol 79 .87

Ionization Potential V 4 .341 Heat of fusion kJ/mol 2 .334

Electronegativity - 0 .82 Specific heat J/gK 0 .75

The oxide is a strong base.
Crystal are body centered cubic.

Electron config. : [Ar] 4s¹

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe

Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113

Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Isotopes of K: Click mass number for decay process, product for element page.

035
190 msec
EC/ECp,11.881
Ar-35/Cl-34
34.988011 036
342 msec
EC/ECa/ECp,12.805
Ar-36/S-32/Cl-35
35.981293 037
1.226 sec
EC,6.149 MeV
Ar-37
36.973376 038
7.636 min
EC,5.913 MeV
Ar-38
37.969080 038a
923.9 msec
EC,6.043 MeV
Ar-38
37.969219 039 93.2581%

Stable

38.963706 040 0.0117%
1.277E+9 yr
B-/EC,1.311
Ca-40/Ar-40
39.963998

041 6.7302%

Stable

40.961825 042
12.360 hr
B-,3.525 MeV
Ca-42
41.962403 043
22.3 hr
B-,1.815 MeV
Ca-43
42.960715 044
22.13 min
B-,5.660 MeV
Ca-44
43.961556 045
17.3 min
B-,4.204 MeV
Ca-45
44.960699 046
105 sec
B-,7.716 MeV
Ca-46
45.961976 047
17.50 sec
B-,6.643 MeV
Ca-47
46.961677

048
6.8 sec
B-/B-n,12.090
Ca-48/Ca-47
47.965512 049
1.26 sec
B-/B-n,10.970
Ca-49/Ca-48
48.967450 050
472 msec
B-/B-n,14.200
Ca-50/Ca-49
49.972731 051
365 msec
B-/B-n,3.560
Ca-51/Ca-50
50.975833 052
105 msec
B-/B-n,8.020
Ca-52/Ca-51
51.982261 053
30 msec
B-/B-n,10.280
Ca-53/Ca-52
52.986732 054
10 msec
B-/B-n,18.000
Ca-54/Ca-53
53.993988

MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 2/6/98. This is not a publication of Phoenix College.

Atomic number	-	19		Density	g/mL	0	.86
Atomic weight	u	39	.0983	Melting point	K	336	.35
Bonding radius	A	2	.03	Boiling point	K	1032
Atomic radius	A	2	.77	Heat of vaporization	kJ/mol	79	.87
Ionization Potential	V	4	.341	Heat of fusion	kJ/mol	2	.334
Electronegativity	-	0	.82	Specific heat	J/gK	0	.75
The oxide is a strong base.				Crystal are body centered cubic.
Electron config. : [Ar] 4s¹
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035 190 msec EC/ECp,11.881 Ar-35/Cl-34 34.988011	036 342 msec EC/ECa/ECp,12.805 Ar-36/S-32/Cl-35 35.981293	037 1.226 sec EC,6.149 MeV Ar-37 36.973376	038 7.636 min EC,5.913 MeV Ar-38 37.969080	038a 923.9 msec EC,6.043 MeV Ar-38 37.969219	039 93.2581% Stable 38.963706	040 0.0117% 1.277E+9 yr B-/EC,1.311 Ca-40/Ar-40 39.963998
041 6.7302% Stable 40.961825	042 12.360 hr B-,3.525 MeV Ca-42 41.962403	043 22.3 hr B-,1.815 MeV Ca-43 42.960715	044 22.13 min B-,5.660 MeV Ca-44 43.961556	045 17.3 min B-,4.204 MeV Ca-45 44.960699	046 105 sec B-,7.716 MeV Ca-46 45.961976	047 17.50 sec B-,6.643 MeV Ca-47 46.961677
048 6.8 sec B-/B-n,12.090 Ca-48/Ca-47 47.965512	049 1.26 sec B-/B-n,10.970 Ca-49/Ca-48 48.967450	050 472 msec B-/B-n,14.200 Ca-50/Ca-49 49.972731	051 365 msec B-/B-n,3.560 Ca-51/Ca-50 50.975833	052 105 msec B-/B-n,8.020 Ca-52/Ca-51 51.982261	053 30 msec B-/B-n,10.280 Ca-53/Ca-52 52.986732	054 10 msec B-/B-n,18.000 Ca-54/Ca-53 53.993988
MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass