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Table

39.10

K

Potassium

Identification

CAS Number: 7440-09-7

Discovery Year: 1807

Discoverer: Sir Humphrey Davy

Discovery Location: England

Properties

Atomic Mass: 39.0983 →Density: 0.89 g/cm³ →

Crust Abundance: 20900 mg/kg

Crystal Structure: BCC

Atomic Dimensions

Atomic Radius: 220 pm →

Atomic Radius (Rahm): 234 pm

Covalent Radius: 202.99999999999997 pm →

Van der Waals Radius: 275 pm

Metallic Radius: 203 pm

Atomic Volume: 45.3 cm³/mol

Lattice Constant: 5.23 Å

Thermodynamics

Melting Point: 336.8 K →Boiling Point: 1047 K →Specific Heat: 0.753 J/(g·K) →Thermal Conductivity: 79 W/(m·K) →Heat of Fusion: 102.5 kJ/mol →Heat of Vaporization: 2.33 kJ/mol →

Heat of Formation: 89 kJ/mol

Electronic Structure

Electron Config: [Ar] 4s

Block: s

Period: 4 →Group: 1 →Electronegativity: 0.82 →Electron Affinity: 0.50147 eV →

Oxidation States: +1

Abundance & Geochemistry

Crust Abundance: 20900 mg/kg

Sea Abundance: 399 mg/L

Geochemical Class: alkali metal

Goldschmidt Class: litophile

About

Potassium is a soft, silvery-white metal that is essential for life. It is commonly found in bananas and is used in fertilizers.

Isotopes

K-39 39 93.26%

K-41 41 6.73%

K-40 40 0.0117%

Related Elements

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K

Potassium

Identification

Properties

Atomic Dimensions

Thermodynamics

Electronic Structure

Abundance & Geochemistry

About

Isotopes

Related Elements

Category

Same Group

Same Period

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