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.
Sign in to save this calculation and access it later.
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.
Example calculation
The calculator above shows the computed answer instantly from these example values.
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.
We work hard to keep every calculator accurate and useful. If you notice a calculation error, missing option, or unclear explanation, please let us know so we can review and correct it promptly.
See how many people are using this calculator.
Total visits today
0
Live users now
0
Total saved calculations
0
Most active date
2026-06-05
FAQ
It uses Nearest element = minimum absolute atomic mass difference and calculates the result from the values you enter.
Yes. AZCalculate calculator pages include copy, share, and print actions.
Related tools
Search elements by name, symbol, atomic number, or approximate atomic mass, then view atomic data and temperature state estimates.
Find an element from its name, symbol, atomic number, or approximate atomic mass.
Calculate approximate molecular weight from element masses and atom counts.
Convert grams to moles using molar mass.
Convert moles to grams using molar mass.
Find an element by atomic number and view its symbol, mass, group, period, and category.
