• Explore SchoolMyKids in English

Periodic Table Element Comparison: Compare Elements - Potassium vs Iron

Compare Potassium and Iron

Compare Potassium and Iron on the basis of their properties, attributes and periodic table facts. Compare elements on more than 90 properties. All the elements of similar categories show a lot of similarities and differences in their chemical, atomic, physical properties and uses. These similarities and dissimilarities should be known while we study periodic table elements. You can study the detailed comparison between Potassium vs Iron with most reliable information about their properties, attributes, facts, uses etc. You can compare K vs Fe on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more.

123456789101112131415161718
1
1
H
Hydrogen
1.008

Atomic #

Electronic Shell #

Symbol
Name
Atomic Weight
HGas
HgLiquid
CSolid
Metals
Metalloids
NonMetals
Alkali metals
Alkali earth metals
Lanthanoids
Transition metals
Post-transition metals
Other nonmetals
Halogens
Nobel gas
Actinoids
2
He
Helium
4.003
2
3
Li
Lithium
6.941
4
Be
Beryllium
9.012
5
B
Boron
10.811
6
C
Carbon
12.011
7
N
Nitrogen
14.007
8
O
Oxygen
15.999
9
F
Fluorine
18.998
10
Ne
Neon
20.180
3
11
Na
Sodium
22.990
12
Mg
Magnesium
24.305
13
Al
Aluminium
26.982
14
Si
Silicon
28.085
15
P
Phosphorus
30.974
16
S
Sulfur
32.065
17
Cl
Chlorine
35.453
18
Ar
Argon
39.948
4
19
K
Potassium
39.098
20
Ca
Calcium
40.078
21
Sc
Scandium
44.956
22
Ti
Titanium
47.867
23
V
Vanadium
50.941
24
Cr
Chromium
51.996
25
Mn
Manganese
54.938
26
Fe
Iron
55.845
27
Co
Cobalt
58.933
28
Ni
Nickel
58.693
29
Cu
Copper
63.546
30
Zn
Zinc
65.409
31
Ga
Gallium
69.723
32
Ge
Germanium
72.640
33
As
Arsenic
74.922
34
Se
Selenium
78.960
35
Br
Bromine
79.904
36
Kr
Krypton
83.798
5
37
Rb
Rubidium
85.468
38
Sr
Strontium
87.620
39
Y
Yttrium
88.906
40
Zr
Zirconium
91.224
41
Nb
Niobium
92.906
42
Mo
Molybdenum
95.940
43
Tc
Technetium
98
44
Ru
Ruthenium
101.070
45
Rh
Rhodium
102.906
46
Pd
Palladium
106.420
47
Ag
Silver
107.868
48
Cd
Cadmium
112.411
49
In
Indium
114.818
50
Sn
Tin
118.710
51
Sb
Antimony
121.760
52
Te
Tellurium
127.600
53
I
Iodine
126.904
54
Xe
Xenon
131.293
6
55
Cs
Cesium
132.905
56
Ba
Barium
137.327
57 - 71
La - Lu
Lanthanides
72
Hf
Hafnium
178.490
73
Ta
Tantalum
180.948
74
W
Tungsten
183.840
75
Re
Rhenium
186.207
76
Os
Osmium
190.230
77
Ir
Iridium
192.217
78
Pt
Platinum
195.078
79
Au
Gold
196.967
80
Hg
Mercury
200.590
81
Tl
Thallium
204.383
82
Pb
Lead
207.200
83
Bi
Bismuth
208.980
84
Po
Polonium
209
85
At
Astatine
210
86
Rn
Radon
222
7
87
Fr
Francium
223
88
Ra
Radium
226
89 - 103
Ac - Lr
Actinides
104
Rf
Rutherfordium
261
105
Db
Dubnium
262
106
Sg
Seaborgium
266
107
Bh
Bohrium
264
108
Hs
Hassium
277
109
Mt
Meitnerium
268
110
Ds
Darmstadtium
281
111
Rg
Roentgenium
272
112
Cn
Copernicium
285
113
Nh
Nihonium
284
114
Fl
Flerovium
289
115
Mc
Moscovium
288
116
Lv
Livermorium
292
117
Ts
Tennessine
294
118
Og
Oganesson
294
Lanthanides
57
La
Lanthanum
138.905
58
Ce
Cerium
140.116
59
Pr
Praseodymium
140.908
60
Nd
Neodymium
144.240
61
Pm
Promethium
145
62
Sm
Samarium
150.360
63
Eu
Europium
151.964
64
Gd
Gadolinium
157.250
65
Tb
Terbium
158.925
66
Dy
Dysprosium
162.500
67
Ho
Holmium
164.930
68
Er
Erbium
167.259
69
Tm
Thulium
168.934
70
Yb
Ytterbium
173.040
71
Lu
Lutetium
174.967
Actinides
89
Ac
Actinium
227
90
Th
Thorium
232.038
91
Pa
Protactinium
231.036
92
U
Uranium
238.029
93
Np
Neptunium
237
94
Pu
Plutonium
244
95
Am
Americium
243
96
Cm
Curium
247
97
Bk
Berkelium
247
98
Cf
Californium
251
99
Es
Einsteinium
252
100
Fm
Fermium
257
101
Md
Mendelevium
258
102
No
Nobelium
259
103
Lr
Lawrencium
262

Facts

NamePotassiumIron
Atomic Number1926
Atomic SymbolKFe
Atomic Weight39.0983 55.845
Phase at STPSolid Solid
ColorSilver Gray
Metallic ClassificationAlkali Metal Transition Metal
Group in Periodic Tablegroup 1 group 8
Group Namelithium familyiron family
Period in Periodic Tableperiod 4 period 4
Block in Periodic Tables -blockd -block
Electronic Configuration[Ar] 4s1 [Ar] 3d6 4s2
Electronic Shell Structure (Electrons per shell)2, 8, 8, 12, 8, 14, 2
Melting Point336.53 K1811 K
Boiling Point1032 K3134 K
CAS NumberCAS7440-09-7 CAS7439-89-6
Neighborhood ElementsNeighborhood Elements of PotassiumNeighborhood Elements of Iron

History

HistoryThe element Potassium was discovered by H. Davy in year 1807 in United Kingdom. Potassium derived its name from New Latin potassa, 'potash' (kalium in Latin).The element Iron was discovered by Unknown in year Before 5000 BCE. Iron derived its name from English word (ferrum in Latin).
DiscoveryH. Davy (1807)Unknown (Before 5000 BCE)
IsolatedH. Davy (1807)Egypt (4000 BCE)

Presence: Abundance in Nature and Around Us

Parts per billion (ppb) by weight / by atoms (1ppb =10^-7 %)

Abundance in Universe3000 / 1001100000 / 20000
Abundance in Sun4000 / 1001000000 / 30000
Abundance in Meteorites710000 / 370000220000000 / 77000000
Abundance in Earth's Crust15000000 / 780000063000000 / 23000000
Abundance in Oceans416000 / 658003 / 0.33
Abundance in Humans2000000 / 32000060000 / 6700

Crystal Structure and Atomic Structure

Atomic Volume45.68 cm3/mol7.0923 cm3/mol
Atomic Radius243 pm156 pm
Covalent Radius196 pm125 pm
Van der Waals Radius275 pm-
Atomic SpectrumAtomic Spectrum of Potassium | SchoolMyKidsAtomic Spectrum of Iron | SchoolMyKids
Lattice Constant532.8, 532.8, 532.8 pm286.65, 286.65, 286.65 pm
Lattice Angleπ/2, π/2, π/2π/2, π/2, π/2
Space Group NameIm_ 3m Im_ 3m
Space Group Number229 229
Crystal Structure

Body Centered Cubic

19 K Potassium - Crystal Structure | SchoolMyKids

Body Centered Cubic

26 Fe Iron - Crystal Structure | SchoolMyKids

Atomic and Orbital Properties

Atomic Number1926
Number of Electrons (with no charge)1926
Number of Protons1926
Mass Number39.098355.845
Number of Neutrons2030
Shell structure (Electrons per energy level)2, 8, 8, 12, 8, 14, 2
Electron Configuration[Ar] 4s1 [Ar] 3d6 4s2
Valence Electrons4s1 3d6 4s2
Oxidation State12, 3
Atomic Term Symbol (Quantum Numbers)2S1/2 5D4
Shell structure19 K Potassium - Electron Shell Structure | SchoolMyKids26 Fe Iron - Electron Shell Structure | SchoolMyKids

Isotopes and Nuclear Properties

Potassium has 2 stable naturally occuring isotopes while Iron has 4 stable naturally occuring isotopes.

Known Isotopes32K, 33K, 34K, 35K, 36K, 37K, 38K, 39K, 40K, 41K, 42K, 43K, 44K, 45K, 46K, 47K, 48K, 49K, 50K, 51K, 52K, 53K, 54K, 55K45Fe, 46Fe, 47Fe, 48Fe, 49Fe, 50Fe, 51Fe, 52Fe, 53Fe, 54Fe, 55Fe, 56Fe, 57Fe, 58Fe, 59Fe, 60Fe, 61Fe, 62Fe, 63Fe, 64Fe, 65Fe, 66Fe, 67Fe, 68Fe, 69Fe, 70Fe, 71Fe, 72Fe
Stable IsotopesNaturally occurring stable isotopes:

39K, 41K

Naturally occurring stable isotopes:

54Fe, 56Fe, 57Fe, 58Fe

Neutron Cross Section 2.1 2.56
Neutron Mass Absorption 0.0018 0.0015

Chemical Properties: Ionization Energies and electron affinity

Valence or Valency1 3
Electronegativity0.82 Pauling Scale1.83 Pauling Scale
Electron Affinity48.4 kJ/mol15.7 kJ/mol
Ionization Energies
1st: 418.8 kJ/mol
2nd: 3052 kJ/mol
3rd: 4420 kJ/mol
4th: 5877 kJ/mol
5th: 7975 kJ/mol
6th: 9590 kJ/mol
7th: 11343 kJ/mol
8th: 14944 kJ/mol
9th: 16963.7 kJ/mol
10th: 48610 kJ/mol
11th: 54490 kJ/mol
12th: 60730 kJ/mol
13th: 68950 kJ/mol
14th: 75900 kJ/mol
15th: 83080 kJ/mol
16th: 93400 kJ/mol
17th: 99710 kJ/mol
18th: 444880 kJ/mol
19th: 476063 kJ/mol
1st: 762.5 kJ/mol
2nd: 1561.9 kJ/mol
3rd: 2957 kJ/mol
4th: 5290 kJ/mol
5th: 7240 kJ/mol
6th: 9560 kJ/mol
7th: 12060 kJ/mol
8th: 14580 kJ/mol
9th: 22540 kJ/mol
10th: 25290 kJ/mol
11th: 28000 kJ/mol
12th: 31920 kJ/mol
13th: 34830 kJ/mol
14th: 37840 kJ/mol
15th: 44100 kJ/mol
16th: 47206 kJ/mol
17th: 122200 kJ/mol
18th: 131000 kJ/mol
19th: 140500 kJ/mol
20th: 152600 kJ/mol
21st: 163000 kJ/mol
22nd: 173600 kJ/mol
23rd: 188100 kJ/mol
24th: 195200 kJ/mol
25th: 851800 kJ/mol
26th: 895161 kJ/mol

Physical Properties

Density0.856 g/cm37.874 g/cm3
Molar Volume45.68 cm3/mol7.0923 cm3/mol

Elastic Properties

Young Modulus- 211
Shear Modulus1.3 GPa82 GPa
Bulk Modulus3.1 GPa170 GPa
Poisson Ratio- 0.29

Hardness - Tests to Measure of Hardness of Element

Mohs Hardness0.4 MPa4 MPa
Vickers Hardness- 608 MPa
Brinell Hardness0.363 MPa490 MPa

Electrical Properties

Electrical Conductivity14000000 S/m10000000 S/m
Resistivity 7e-8 m Ω9.7e-8 m Ω
Superconducting Point- -

Heat and Conduction Properties

Thermal Conductivity100 W/(m K)80 W/(m K)
Thermal Expansion- 0.0000118 /K

Magnetic Properties

Magnetic TypeParamagnetic Ferromagnetic
Curie Point- 1043 K
Mass Magnetic Susceptibility6.7e-9 m3/kg-
Molar Magnetic Susceptibility2.62e-10 m3/mol-
Volume Magnetic Susceptibility0.00000574 -

Optical Properties

Refractive Index- -

Acoustic Properties

Speed of Sound2000 m/s4910 m/s

Thermal Properties - Enthalpies and thermodynamics

Melting Point336.53 K1811 K
Boiling Point1032 K3134 K
Critical Temperature2223 K-
Superconducting Point- -

Enthalpies

Heat of Fusion2.33 kJ/mol13.8 kJ/mol
Heat of Vaporization76.9 kJ/mol347 kJ/mol
Heat of Combustion-182 J/(kg K)-

Regulatory and Health - Health and Safety Parameters and Guidelines

CAS NumberCAS7440-09-7 CAS7439-89-6
RTECS NumberRTECSTS6460000 RTECSNO4565500
DOT Hazard Class4.3 4.1
DOT Numbers2257 3089
EU Number- -
NFPA Fire Rating3 1
NFPA HazardsWater Reactive -
NFPA Health Rating3 1
NFPA Reactivity Rating2 0
AutoIgnition Point440 °C100 °C
Flashpoint- -

Compare With Other Elements

Compare Potassium with all Group 1 elements

Compare Potassium with all Period 4 elements

Compare Potassium with all Alkali Metal elements

Compare Iron with all Group 8 elements

Compare Iron with all Period 4 elements

Compare Iron with all Transition Metal elements