Krypton (Kr) – Periodic Table [Element Information & More]

krypton element periodic table

Krypton element (Kr) is in group 18 and period 4 of a periodic table. Krypton is in the p-block and it is classified as a noble gas element on the periodic table.

There is a lot more information related to krypton which is mentioned in the Information Table given below.

So let’s dive right into it!

Table of contents

Krypton Element (Information Table)

The important data related to krypton element is given in the table below.

Appearance of kryptonColorless gas
Atomic number of krypton36
Symbol of kryptonKr
Atomic mass of krypton83.798 u
Protons, Neutrons & Electrons in kryptonProtons: 36, Neutrons: 48, Electrons: 36
State of krypton (at STP)Gas
Group number of krypton in periodic table18
Period number of krypton in periodic table4
Block of krypton in periodic tablep-block
Category of kryptonNoble gas
Bohr model or Electrons per shell or Electrons arrangement in krypton2, 8, 18, 8
Electron configuration of krypton[Ar] 3d10 4s2 4p6
Orbital diagram of kryptonorbital diagram of krypton
Valence electrons in krypton8
Electronegativity of krypton (on pauling scale)3.00
Atomic radius of krypton (van der Waals radius)202 picometers
Density of krypton3.75 g/L
1st ionization energy of krypton14.00 eV
Main isotope of krypton84Kr
Melting point of krypton115.7 K or -157.3 °C or -251.2 °F
Boiling point of krypton119.9 K or -153.4 °C or -244.1 °F
Crystal structure of kryptonFace Centered Cubic (FCC)
Discovery of kryptonBy William Ramsay and Morris Travers in 1898

Also see: Interactive Periodic Table (It has rotating bohr models as well as many other details of all the 118 elements in a single periodic table).

Krypton element in Periodic table

The Krypton element (Kr) has the atomic number 36 and is located in group 18 and period 4. Krypton is a nonmetal and it is classified as a noble gas element.

H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac** Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
*Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
**Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Facts about krypton

Here are a few interesting facts about krypton element.

  1. Krypton is named after the Greek word “kryptos” (which means hidden).
  2. Earth’s atmosphere contains very less quantity of krypton (around 1 ppm by volume).
  3. Krypton is also present in the atmosphere of Mars (with the concentration of only 0.3 ppm).
  4. Krypton is obtained from the fission of uranium.
  5. Krypton glows with a smoky white light when it is exposed to electric current under low pressure.

Properties of krypton

Here is a list of some physical properties and chemical properties of krypton.

Physical properties of krypton

  • Krypton is colorless, odorless and tasteless gas.
  • The melting point and boiling point of krypton is 115.7 K and 119.9 K respectively.
  • Krypton has an atomic mass of 83.798 u and its density is 3.75 g/L.
  • Krypton has FCC crystal structure.
  • There are many stable isotopes as well as synthetic isotopes and out of these isotopes, the most abundant isotope is 84Kr.
  • The van der Waals atomic radius of the krypton atom is 202 pm.

Chemical properties of krypton

  • Krypton has an electron shell arrangement: 2, 8, 18, 8. This indicates that it has a stable octet and it is chemically inert.
  • Krypton is chemically inert gas and so it does not have more chemical properties.
  • Krypton reacts with highly reactive fluorine element under certain conditions to form krypton difluoride.

Uses of krypton

Here are some uses of the krypton element.

  • Krypton gas is filled in incandescent bulbs which protects the filament from oxidation.
  • The isotope of krypton (81Kr), is used to determine the age of ice of polar regions.
  • One of the isotopes of krypton is also used in some applications in MRI technology.
  • Krypton is also used in double glazed windows which acts as a thermal insulation.
  • Krypton is also used for flashes in photography (because krypton can produce bright white light).

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