Which element has 19 electrons

potassium

The Interactive Periodic Table of the Elements (PSE)

Potassium: characteristics

Potassium (official name according to IUPAC)
1 (old nomenclature: Group I A)
39.098 u (rounded to the five significant digits)
39.0983 u +/- 1 digit (s) [1]
2.4% (percentage by mass of the earth's shell, i.e. the earth's crust / oceans up to a depth of 16 km)

Potassium: atomic properties

kJ / moleV
1.418.8 kJ / mol4,341 eV
2.3052 kJ / mol31.632 eV
3.4420 kJ / mol45.810 eV
4.5877 kJ / mol60.911 eV
5.7975 kJ / mol82.655 eV
6.9590 kJ / mol99.393 eV
7.11343 kJ / mol117.562 eV
8.14944 kJ / mol154.884 eV
9.16963.7 kJ / mol175.816 eV
10.48610 kJ / mol503,807 eV
11.54490 kJ / mol564.749 eV
12.60730 kJ / mol629,422 eV
13.68950 kJ / mol714,617 eV
14.75900 kJ / mol786.648 eV
15.83080 kJ / mol861.064 eV
16.93,400 kJ / mol968,023 eV
17.99710 kJ / mol1033,422 eV
18.444880 kJ / mol4610.857 eV
19.476063 kJ / mol4934,047 eV
Electronegativity (Pauling):
Electronegativity (Allred / Rochow):
Number of unstable isotopes:
isotopefrequency
39K93,2581%
40K0,0117%
41K6,7302%
isotopeHalf-life
42K12h

(The list contains only the most important isotope with a known half-life.)
[Ar] 4s
OrbitalElectrons
1s2
2s2
2p6
3s2
3p6
3d0
4s1
4p0
4d0
4f0
  • 1 electrons in the outermost occupied shell
  • 8 electrons in the second to last occupied shell
  • 8 electrons in the occupied shell below

Potassium: substance properties

fixed (under normal conditions)
Specific heat of fusion:
Specific heat of vaporization:
Thermal conductivity:
Specific heat capacity:
Electric conductivity:
0.862 g / cm3
(under normal conditions)
84 · 10-6/ K
(linear thermal expansion coefficient α)
578.2 nm
404.4 nm
428.3 nm
428.3 nm
430.2 nm
533.5 nm
535.4 nm
580.2 nm
581.2 nm
583.2 nm
691.1 nm
693.8 nm
766.5 nm
769.0 nm


 
Remarks:
  1. 1 digit = least significant digit, i.e. 2.435 +/- 3 digits means 2.432 ... 2.438
  2. The "CAS Registry Number" is that of the element potassium from Chemical Abstracts Service Assigned key number, which makes it easier to find specialist articles about this element in all publications and databases structured according to the CAS system.
    Legal notice: CAS registry number is a registered trademark of the American Chemical Society.