19
K
39.098
Potassium (K)
Element 19 · Period 4 · Group 1
alkali-metal
solid at room temp
s-block
About Potassium
Highly reactive alkali metal. Essential electrolyte in cells. Important in agriculture as fertilizer.
Physical Properties
Atomic Mass
39.098 u
State at 25°C
Solid
Melting Point
63.38 °C
Boiling Point
759 °C
Density
0.862 g/cm³
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Ar] 4s¹
Electron Shells
2, 8, 8, 1
Electronegativity
0.82
Atomic Radius
243 pm
Ionization Energy
419 kJ/mol
Oxidation States
+1
Discovery & History
Discovered By
Humphry Davy
Discovery Year
1807
Named By
Humphry Davy
Name origin: English: potash; Symbol from Latin: kalium
Frequently Asked Questions
- Is Potassium a metal, nonmetal, or metalloid?
- Potassium is classified as a alkali-metal.
- What state is Potassium in at room temperature?
- Potassium is a solid at standard room temperature (25°C).
- What is the atomic mass of Potassium?
- Potassium has an atomic mass of 39.098 atomic mass units (u).
- Who discovered Potassium?
- Potassium was discovered by Humphry Davy in 1807.
- Where is Potassium on the periodic table?
- Potassium is element number 19, located in period 4 and group 1.