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silvery gray

Potassium pearls under paraffin oil. The large pearl measures 0.5 cm. Below: spectral lines of potassium
General properties
Name, simbolo, kaiphan potassium, K, 19
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Element category puthaw
Group, period, block 14, s
Standard atomic weight 39.0983(1)
Electron configuration [Ar] 4s1
2, 8, 8, 1
Electron shells of potassium (2, 8, 8, 1)
Discovery Humphry Davy (1807)
First isolation Humphry Davy (1807)
Physical properties
Phase magahi
Density (near r.t.) 0.862 g·cm−3
Liquid density at m.p. 0.828 g·cm−3
Melting point 336.53 K, 63.38 °C, 146.08 °F
Boiling point 1032 K, 759 °C, 1398 °F
Triple point 336.35 K (63°C),  kPa
Heat of fusion 2.33 kJ·mol−1
Heat of vaporization 76.9 kJ·mol−1
Molar heat capacity 29.6 J·mol−1·K−1
Atomic properties
Oxidation states 1
(strongly basic oxide)
Electronegativity 0.82 (Pauling scale)
Ionization energies
1st: 418.8 kJ·mol−1
2nd: 3052 kJ·mol−1
3rd: 4420 kJ·mol−1
Atomic radius 227 pm
Covalent radius 203±12 pm
Van der Waals radius 275 pm
Crystal structure body-centered cubic
Potassium has a body-centered cubic crystal structure
Magnetic ordering paramagnetic
Electrical resistivity (20 °C) 72 nΩ·m
Thermal conductivity 102.5 W·m−1·K−1
Thermal expansion (25 °C) 83.3 µm·m−1·K−1
Speed of sound (thin rod) (20 °C) 2000 m·s−1
Young's modulus 3.53 GPa
Shear modulus 1.3 GPa
Bulk modulus 3.1 GPa
Mohs hardness 0.4
Brinell hardness 0.363 MPa
CAS registry number 7440-09-7
Most stable isotopes
Main article: Isotopes of potassium
iso NA half-life DM DE (MeV) DP
39K 93.26% 39K is stable with 20 neutrons
40K 0.012% 1.248(3)×109 y β 1.311 40Ca
ε 1.505 40Ar
β+ 1.505 40Ar
41K 6.73% 41K is stable with 22 neutrons
· r

Ang potasio (Iningles potassium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga K ug kaiphan nga atomik 19. Ang potasio mao ang puthaw.

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