Kr Krypton – Element Information, Facts, Properties, Trends,Uses, Comparison with other elements

36
Kr
Krypton

Krypton

Element 36 of Periodic table is Krypton with atomic number 36, atomic weight 83.798. Krypton, symbol Kr, has a Face Centered Cubic structure and Colorless color. Krypton is a noble gas element. Trivial name of Krypton is noble gases*, aerogens. Know everything about Krypton Facts, Physical Properties, Chemical Properties, Electronic configuration, Atomic and Crystal Structure.

36 Kr - Krypton | SchoolMyKids

Krypton (from Greek:κρυπτός kryptos "the hidden one") is a chemical element with symbol Kr and atomic number 36. It is a member of group 18 (noble gases) elements. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere, is isolated by fractionally distilling liquefied air, and is often used with other rare gases in fluorescent lamps.

How to Locate Krypton on Periodic Table

Periodic table is arranged by atomic number, number of protons in the nucleus which is same as number of electrons. The atomic number increases from left to right. Periodic table starts at top left ( Atomic number 1) and ends at bottom right (atomic number 118). Therefore you can directly look for atomic number 36 to find Krypton on periodic table.

Another way to read periodic table and locate an element is by using group number (column) and period number (row). To locate Krypton on periodic table look for cross section of group 18 and period 4 in the modern periodic table.

Table of Contents

Krypton History

The element Krypton was discovered by William Ramsay in year 1898 in United Kingdom . Krypton derived its name from the Greek kryptos, meaning 'hidden'

Krypton Presence: Abundance in Nature and Around Us

The table below shows the abundance of Krypton in Universe, Sun, Meteorites, Earth's Crust, Oceans and Human Body.

  Ppb by weight (1ppb =10^-7 %)
Abundance in Universe 4×10-6%
Abundance in Sun N/A
Abundance in Meteorites N/A
Abundance in Earth's Crust 1.5×10-8%
Abundance in Oceans 2.1×10-8%
Abundance in Humans N/A

Crystal Structure of Krypton

The solid state structure of Krypton is Face Centered Cubic.

The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in three dimensional space to form the structure.

Unit Cell Parameters

The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell edges Lattice Constants (a, b and c)

a b c
570.6 570.6 570.6 pm

and the angles between them Lattice Angles (alpha, beta and gamma).

alpha beta gamma
π/2 π/2 π/2

The positions of the atoms inside the unit cell are described by the set of atomic positions ( xi, yi, zi) measured from a reference lattice point.

The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particles in three-dimensional space are described by the 230 space groups (219 distinct types, or 230 if chiral copies are considered distinct.

Space Group Name Fm_ 3m 36 Kr Krypton - Crystal Structure | SchoolMyKids
Space Group Number 225
Crystal Structure Face Centered Cubic

Krypton Atomic and Orbital Properties

Krypton atoms have 36 electrons and the electronic shell structure is [2, 8, 18, 8] with Atomic Term Symbol (Quantum Numbers) 1S0.

Atomic Number 36
Number of Electrons (with no charge) 36
Number of Protons 36
Mass Number 84
Number of Neutrons 48
Shell structure (Electrons per energy level) [2, 8, 18, 8]
Electron Configuration [Ar] 3d10 4s2 4p6
Valence Electrons 4s2 4p6
Oxidation State 2
Atomic Term Symbol (Quantum Numbers) 1S0

Shell Structure of Krypton - Electrons per energy level

36 Kr Krypton - Electron Shell Structure | SchoolMyKids
n s p d f
1 K 2
2 L 2 6
3 M 2 6 10
4 N 2 6

Ground State Electronic Configuration of Krypton - neutral Krypton atom

The ground state electronic configuration of Neutral Krypton atom is [Ar] 3d10 4s2 4p6. The portion of Krypton configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Ar]. For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used.This is important as it is the Valence electrons 3d10 4s2 4p6, electrons in the outermost shell that determine the chemical properties of the element.

Unabbreviated electronic configuration of neutral Krypton

Complete ground state electronic configuration for the Krypton atom, Unabbreviated electronic configuration

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6

Atomic Structure of Krypton

Krypton atomic radius is 88 pm, while it's covalent radius is 110 pm.

Atomic Radius

88 pm (0.88 Å)

Atomic Volume 22.3461333333 cm3
Covalent Radius 110 pm (1.1 Å)
Van der Waals Radius 202 pm
Neutron Cross Section 25 σa/barns

Atomic Spectrum of Krypton

Atomic Spectrum of Krypton | SchoolMyKids

Krypton Chemical Properties: Krypton Ionization Energies and electron affinity

The electron affinity of Krypton is 0 kJ/mol

Valence 2
Electronegativity 3
ElectronAffinity 0 kJ/mol

Ionization Energy of Krypton

Refer to table below for Ionization energies of Krypton

Ionization energy number Enthalpy - kJ/mol
1 1350.8
2 2350.4
3 3565
4 5070
5 6240
6 7570
7 10710
8 12138
9 22274
10 25880
11 2.97×104
12 3.38×104
13 3.77×104
14 4.31×104
15 4.75×104
16 5.22×104
17 5.71×104
18 6.18×104
19 7.58×104
20 8.04×104
21 8.53×104

Krypton Physical Properties

Refer to below table for Krypton Physical Properties

Density 3.75 g/l
Molar Volume 22.3461333333 cm3

Elastic Properties

Young Modulus N/A
Shear Modulus N/A
Bulk Modulus N/A
Poisson Ratio N/A

Hardness of Krypton - Tests to Measure of Hardness of Element

Mohs Hardness N/A
Vickers Hardness N/A
Brinell Hardness N/A

Krypton Electrical Properties

Krypton is N/A of electricity. Refer to table below for the Electrical properties of Krypton

Electrical Conductivity N/A
Resistivity N/A
Superconducting Point N/A

Krypton Heat and Conduction Properties

Thermal Conductivity 0.00943 W/(m K)
Thermal Expansion N/A

Krypton Magnetic Properties

Magnetic Type Diamagnetic
Curie Point N/A
Mass Magnetic Susceptibility -4.4×10-9
Molar Magnetic Susceptibility -3.69×10-10
Volume Magnetic Susceptibility -1.65×10-8

Optical Properties of Krypton

Refractive Index 1.000427

Acoustic Properties of Krypton

Speed of Sound 1120 m/s

Krypton Thermal Properties - Enthalpies and thermodynamics

Refer to table below for Thermal properties of Krypton

Melting Point 115.79 K (-157.36 °C)
Boiling Point 119.93 K (-153.22 °C)
Critical Temperature 209.41 K
Superconducting Point N/A

Enthalpies of Krypton

Heat of Fusion 1.64 kJ/mol
Heat of Vaporization 9.02 kJ/mol
Heat of Combustion N/A

Krypton Isotopes - Nuclear Properties of Krypton

Isotopes of rhodium. Naturally occurring Krypton has 6 stable isotope - 78Kr, 80Kr, 82Kr, 83Kr, 84Kr, 86Kr.

Isotope Isotope Mass % Abundance T half Decay Mode
69Kr  
70Kr  
71Kr  
72Kr  
73Kr  
74Kr  
75Kr  
76Kr  
77Kr  
78Kr   0.35% Stable N/A
79Kr  
80Kr   2.28% Stable N/A
81Kr  
82Kr   11.58% Stable N/A
83Kr   11.49% Stable N/A
84Kr   57% Stable N/A
85Kr  
86Kr   17.3% Stable N/A
87Kr  
88Kr  
89Kr  
90Kr  
91Kr  
92Kr  
93Kr  
94Kr  
95Kr  
96Kr  
97Kr  
98Kr  
99Kr  
100Kr  

Regulatory and Health - Health and Safety Parameters and Guidelines

CAS Number CAS7439-90-9
RTECS Number RTECSOC6772500
DOT Hazard Class 2.2
DOT Numbers 1970
EU Number EU231-098-5
NFPA Fire Rating N/A
NFPA Hazards N/A
NFPA Health Rating N/A
NFPA Reactivity Rating N/A
Autoignition Point N/A
Flashpoint N/A

Database Search

List of unique identifiers to search the element in various chemical registry databases

Database Identifier number
CAS Number - Chemical Abstracts Service (CAS) CAS7439-90-9
CID Number CID5416
Gmelin Number Gmelin16201
NSC Number N/A
RTECS Number RTECSOC6772500

List of Elements
1 H - Hydrogen
2 He - Helium
3 Li - Lithium
4 Be - Beryllium
5 B - Boron
6 C - Carbon
7 N - Nitrogen
8 O - Oxygen
9 F - Fluorine
10 Ne - Neon
11 Na - Sodium
12 Mg - Magnesium
13 Al - Aluminium
14 Si - Silicon
15 P - Phosphorus
16 S - Sulfur
17 Cl - Chlorine
18 Ar - Argon
19 K - Potassium
20 Ca - Calcium
21 Sc - Scandium
22 Ti - Titanium
23 V - Vanadium
24 Cr - Chromium
25 Mn - Manganese
26 Fe - Iron
27 Co - Cobalt
28 Ni - Nickel
29 Cu - Copper
30 Zn - Zinc
31 Ga - Gallium
32 Ge - Germanium
33 As - Arsenic
34 Se - Selenium
35 Br - Bromine
36 Kr - Krypton
37 Rb - Rubidium
38 Sr - Strontium
39 Y - Yttrium
40 Zr - Zirconium
41 Nb - Niobium
42 Mo - Molybdenum
43 Tc - Technetium
44 Ru - Ruthenium
45 Rh - Rhodium
46 Pd - Palladium
47 Ag - Silver
48 Cd - Cadmium
49 In - Indium
50 Sn - Tin
51 Sb - Antimony
52 Te - Tellurium
53 I - Iodine
54 Xe - Xenon
55 Cs - Cesium
56 Ba - Barium
57 La - Lanthanum
58 Ce - Cerium
59 Pr - Praseodymium
60 Nd - Neodymium
61 Pm - Promethium
62 Sm - Samarium
63 Eu - Europium
64 Gd - Gadolinium
65 Tb - Terbium
66 Dy - Dysprosium
67 Ho - Holmium
68 Er - Erbium
69 Tm - Thulium
70 Yb - Ytterbium
71 Lu - Lutetium
72 Hf - Hafnium
73 Ta - Tantalum
74 W - Tungsten
75 Re - Rhenium
76 Os - Osmium
77 Ir - Iridium
78 Pt - Platinum
79 Au - Gold
80 Hg - Mercury
81 Tl - Thallium
82 Pb - Lead
83 Bi - Bismuth
84 Po - Polonium
85 At - Astatine
86 Rn - Radon
87 Fr - Francium
88 Ra - Radium
89 Ac - Actinium
90 Th - Thorium
91 Pa - Protactinium
92 U - Uranium
93 Np - Neptunium
94 Pu - Plutonium
95 Am - Americium
96 Cm - Curium
97 Bk - Berkelium
98 Cf - Californium
99 Es - Einsteinium
100 Fm - Fermium
101 Md - Mendelevium
102 No - Nobelium
103 Lr - Lawrencium
104 Rf - Rutherfordium
105 Db - Dubnium
106 Sg - Seaborgium
107 Bh - Bohrium
108 Hs - Hassium
109 Mt - Meitnerium
110 Ds - Darmstadtium
111 Rg - Roentgenium
112 Cn - Copernicium
113 Nh - Nihonium
114 Fl - Flerovium
115 Mc - Moscovium
116 Lv - Livermorium
117 Ts - Tennessine
118 Og - Oganesson
Metalloid
Nonmetals
Other Nonmetals
Halogens Noble Gas
Metals
Alkali Metals Alkaline Earth Metals
Transition Metals Post-Transition Metals
Lanthanide Actinide