Element Information, Facts, Properties, Trends, Uses, Comparison with other elements
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.
It belongs to group 18 of the periodic table having trivial name noble gases, aerogens.
Read key information and facts about element Krypton
|Phase||Gas (Monoatomic Gas )|
|Appearance||colorless gas, exhibiting a whitish glow in a high electric field|
|Group in Periodic Table||18|
|Group Name||helium family or neon family|
|Period in Periodic Table||period 4|
|Block in Periodic Table||p -block|
|Electronic Configuration||[Ar] 3d10 4s2 4p6|
|Electronic Shell Structure (Electrons per shell)||2, 8, 18, 8|
|Melting Point||115.79 K|
|Boiling Point||119.93 K|
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.
The element Krypton was discovered by W. Ramsay and W. Travers in year 1898 in United Kingdom. Krypton was first isolated by W. Ramsay and W. Travers in 1898. Krypton derived its name from the Greek kryptos, meaning 'hidden'.
On May 30, 1898, Ramsay separated a noble gas from liquid argon by difference in boiling point.
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 %)||ppb by atoms (1ppb =10^-7 %)|
|Abundance in Universe||40||0.6|
|Abundance in Sun||-||-|
|Abundance in Meteorites||-||-|
|Abundance in Earth's Crust||0.15||0.04|
|Abundance in Oceans||0.21||0.016|
|Abundance in Humans||-||-|
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)
|570.6 pm||570.6 pm||570.6 pm|
and the angles between them Lattice Angles (alpha, beta and gamma).
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|
|Space Group Number||225|
|Crystal Structure||Face Centered Cubic|
|Number of atoms per unit cell||4|
The number of atoms per unit cell in a simple cubic, face-centered cubic and body-centred cubic are 1,4,2 respectively.
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.
|Number of Electrons (with no charge)||36|
|Number of Protons||36|
|Number of Neutrons||48|
|Shell structure (Electrons per energy level)||2, 8, 18, 8|
|Electron Configuration||[Ar] 3d10 4s2 4p6|
|Valence Electrons||4s2 4p6|
|Main Oxidation States||0|
|Oxidation States||0, 1, 2|
|Atomic Term Symbol (Quantum Numbers)||1S0|
Bohr Atomic Model of Krypton - Electrons per energy level
Ground State Electronic Configuration of Krypton - neutral Krypton atom
Abbreviated electronic configuration of Krypton
The ground state abbreviated 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 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
Electrons are filled in atomic orbitals as per the order determined by the Aufbau principle, Pauli Exclusion Principle and Hund’s Rule.
Atomic Structure of Krypton
Krypton atomic radius is 88 pm, while it's covalent radius is 110 pm.
|Atomic Radius Calculated|
88 pm (0.88 Å)
|Atomic Radius Empirical|
- (0 Å)
|Atomic Volume||22.35 cm3/mol|
|Covalent Radius||110 pm (1.1 Å)|
|Van der Waals Radius||202 pm|
|Neutron Cross Section||25|
|Neutron Mass Absorption||0.013|
Atomic Spectrum of Krypton
Krypton Chemical Properties: Krypton Ionization Energies and electron affinity
The electron affinity of Krypton is 0 kJ/mol.
Ionization Energy of Krypton
Refer to table below for Ionization energies of Krypton
|Ionization energy number||Enthalpy - kJ/mol|
Krypton Physical Properties
Refer to below table for Krypton Physical Properties
|Molar Volume||22.35 cm3/mol|
Hardness of Krypton - Tests to Measure of Hardness of Element
Krypton Electrical Properties
Krypton is Conductor of electricity. Refer to table below for the Electrical properties ofKrypton
Krypton Heat and Conduction Properties
|Thermal Conductivity||0.00943 W/(m K)|
Krypton Magnetic Properties
|Mass Magnetic Susceptibility||-4.4e-9 m3/kg|
|Molar Magnetic Susceptibility||-3.69e-10 m3/mol|
|Volume Magnetic Susceptibility||-1.65e-8|
Optical Properties of Krypton
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, -251.24799999999993 °F)|
|Boiling Point||119.93 K (-153.22°C, -243.79599999999994 °F)|
|Critical Temperature||209.41 K|
Enthalpies of Krypton
|Heat of Fusion||1.64 kJ/mol|
|Heat of Vaporization||9.02 kJ/mol|
|Heat of Combustion||-|
Krypton Isotopes - Nuclear Properties of Krypton
Krypton has 32 isotopes, with between 69 and 100 nucleons. Krypton has 6 stable naturally occuring isotopes.
Isotopes of Krypton - Naturally occurring stable Isotopes: 78Kr, 80Kr, 82Kr, 83Kr, 84Kr, 86Kr.
|Isotope||Z||N||Isotope Mass||% Abundance||T half||Decay Mode|
Regulatory and Health - Health and Safety Parameters and Guidelines
List of unique identifiers to search the element in various chemical registry databases
|CAS Number - Chemical Abstracts Service (CAS)||CAS7439-90-9|
Compare Krypton with other elements
Compare Krypton with all Group 18 elements
Compare Krypton with all Period 4 elements
Compare Krypton with all Noble Gas elements
What is the electronic configuration of Krypton?
The electronic configuration of Krypton is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6.
What is the abbreviated electronic configuration of Krypton?
The abbreviated electronic configuration of Krypton is [Ar] 3d10 4s2 4p6. To form abbreviated notation of electronic configuration, the completely filled subshells are replaced by the noble gas of the preceding period in square brackets.
What is the symbol of Krypton?
Symbol of Krypton is Kr. Krypton is a chemical element with symbol Kr and atomic number 36.
What is the position of Krypton in the Periodic Table?
Krypton is a chemical element with the symbol Kr and atomic number 36. Krypton is the 36 element on the periodic table. It is located in group 18 and period 4 in the modern periodic table.
What is the atomic number of Krypton?
The atomic number of Krypton is 36.
What is the color of Krypton?
Krypton is Colorless.
Who discovered Krypton?
The element Krypton was discovered by W. Ramsay and W. Travers in year 1898 in United Kingdom. Krypton was first isolated by W. Ramsay and W. Travers in 1898.
How many valence electrons does a Krypton atom have?
Krypton has 2 valence electrons. Krypton has 36 electrons out of which 2 valence electrons are present in the 4s2 4p6 outer orbitals of atom.
What is the melting Point of Krypton?
Melting Point of Krypton is 115.79 K.
What is the boiling Point of Krypton?
Boiling Point of Krypton is 119.93 K.
What is the melting Point of Krypton in Kelvin?
Melting Point of Krypton in Kelvin is 115.79 K.
What is the boiling Point of Krypton in Kelvin?
Boiling Point of Krypton in Kelvin is 119.93 K.
What is the electronic configuration of Krypton 36?
The electronic configuration of Krypton will be 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6.
How do you write the electron configuration for Krypton?
The electronic configuration of Krypton will be 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6.