Chemistry
Use this atomic weight calculator to calculate look up atomic weight and nearest matching elements by approximate atomic mass.
Calculator
Element result
Potassium
Atomic number
19
Atomic mass
39.0983 u
Group
1
Period
4
Block
s-block
Phase at room temp
solid
Potassium is a soft alkali metal and an essential electrolyte in living organisms.
Electron configuration
[Ar] 4s1
Electronegativity
0.82
Density
0.862 g/cm3
Melting point
336.53 K
Boiling point
1032 K
Discovered by
Humphry Davy
Year discovered
1807
Common uses
Fertilizers, Glass, Soaps, Biological electrolytes
Celsius
25 C
Fahrenheit
77 F
Kelvin
298.15 K
At this temperature, Potassium is expected to be solid.
Melting point: 336.53 K
Boiling point: 1032 K
Physical state estimates are based on standard pressure and may change under different pressure conditions.
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Trust note
Use this result as a practical estimate. Real-world conditions, local rules, measurement tolerance, and changing inputs can affect the final outcome.
Nearest element = minimum absolute atomic mass difference
This calculator applies the formula Nearest element = minimum absolute atomic mass difference. Enter each value with the matching unit, and AZCalculate updates the result instantly.
Assumptions
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Worked example
Atomic mass: 196.97 u
Calculator guide
Look up atomic weight and nearest matching elements by approximate atomic mass. This page includes an interactive calculator, concise formula notes, worked examples, FAQs, related calculators, and practical guidance you can revisit whenever needed.
References
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FAQ
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