Elements
36

Kr

Krypton

Krypton (Kr) exists as a colourless, odourless gas and is chemically inert. It has the atomic number 36 in the periodic table and belongs in Group 18, the Noble Gases. It is a non metal with the symbol Kr.

Krypton like most Noble gases is odourless, colourless and inert. It was discovered in 1898 by Scottish chemist William Ramsey and his assistant Morris Travers. Ramsey had a track record of discovering Noble gases having discovered helium and argon. He had built up a picture of the gases existing in the same group. Obtaining a sample of air as a liquid they began to evaporate off gases. After removing Nitrogen and Oxygen by heating with Copper and Magnesium, they applied a high voltage to the left over gases and produced a yellow and green spectrum, which had never been seen before. They named the new gas Krypton, from the Greek ‘kryptos’ meaning ‘hidden.’ Krypton as a gas was used as a scientific length between 1960 and 1973 as the measurement of a metre being defined as 1 650 763.73 wavelengths of krypton-86’s orange-red spectral line. Krypton’s main uses are in photography equipment for lighting and in high powered lasers. It is located in Group 18 as a non metal gas which is odourless and colourless. It has a melting point of -157°c and a boiling point of -153°c.

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FAQ's

What is the Melting Point for Krypton?

Krypton has a Melting Point of -156.6°F, meaning at -156.6°F it will turn to a liquid.

What is the Boiling Point for Krypton?

Krypton has a Boiling Point of -152.3°F, meaning at -152.3°F it will turn to a Gas.

What is the Electronegativity of Krypton?

Krypton's Electronegativty is 3. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Krypton?

Krypton has a Heat of Vaporization of 9.029 kJ/mol.

Uses

Used in lighting products. Some is used as inert filler-gas in incandescent bulbs. Some is mixed with argon in fluorescent lamps. The most important use is in flashing stroboscopic lamps that outline airport runways.

Sources

Forms 1 millionth of the atmosphere. Obtained from production of liquid air.

36
Protons
36
Electrons
48
Neutrons

Kr

Element Symbol
Kr
Atomic Weight
83.798
Atomic Number
36
State
Gas
Melting Point
Unknown
-156.6
°C
Boiling Point
-152.3
Unknown
°C
Heat of Vaporization
9.029
Unknown
kJ/mol
Crystal Structure
Cubic: Face centered
Thermoconductivity
0.0000949
Unknown
W/cmK
Shells
2,8,18,8
Group
Noble Gas
Period
4
Block
P Block
Orbitals
[Ar] 3d10 4s2 4p6
Coefficient of Thermal Expansion
425 10^-6 K^-1
Covalent Radius
1.12 Å
Density at 293K
0.003708 g/cm³
Electrical Conductivity
--
First Ionization Potential
13.9996 V
Second Ionization Potential
24.359 V
Third Ionization Potential
36.95 V
Ionic Radius
--
Oxydation States
0
Lattice Parameter
--
Lattice Parameter 2
--
Lattice Parameter 3
5.7308 Å
Pronounced

KRIP-ton

Discovered by

Sir William Ramsey, M.W. Travers

Discovery date

1898

Orbital configuration
2,8,18,8

Download the Periodic Table

Explore Other Noble Gass

222
86

Rn

Radon
20.18
10

Ne

Neon
39.948
18

Ar

Argon
4.003
2

He

Helium
131.293
54

Xe

Xenon
294
118

Og

Oganesson
Noble gases are seven chemical elements that make up group 18 (VIIIa) of the periodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn) and oganesson (Og). They are colorless, odorless, tasteless, nonflammable gases.
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