Radium (Ra) – Periodic Table [Element Information & More]

radium element periodic table

Radium element (Ra) is in group 2 and period 7 of a periodic table. Radium is in the s-block and it is classified as an alkaline earth metal on the periodic table.

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

So let’s dive right into it!

Table of contents

Radium Element (Information Table)

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

Appearance of radiumSilvery white metallic
Atomic number of radium88
Symbol of radiumRa
Atomic mass of radium (most stable isotope)226 u
Protons, Neutrons & Electrons in radiumProtons: 88, Neutrons: 138, Electrons: 88
State of radium (at STP)Solid
Group number of radium in periodic table2
Period number of radium in periodic table7
Block of radium in periodic tables-block
Category of radiumAlkaline earth metals
Bohr model or Electrons per shell or Electrons arrangement in radium2, 8, 18, 32, 18, 8, 2
Electron configuration of radium[Rn] 7s2
Orbital diagram of radiumorbital diagram of radium
Valence electrons in radium2
Electronegativity of radium (on pauling scale)0.9
Atomic radius of radium (van der Waals radius)283 picometers
Density of radium5 g/cm3
1st ionization energy of radium5.27 eV
Main isotope of radium226Ra
Melting point of radium973 K or 700 °C or 1292 °F
Boiling point of radium2010 K or 1737 °C or 3159 °F
Crystal structure of radiumBody Centered Cubic (BCC)
Discovery of radiumBy Pierre Curie and Marie Curie (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).

Radium element in Periodic table

The Radium element (Ra) has the atomic number 88 and is located in group 2 and period 7. Radium is in solid state at STP and it is classified as an alkaline earth metal on the periodic table.

Click on above elements in the periodic table to see their information.

Facts about radium

Here are a few interesting facts about radium element.

  1. Pierre Curie and Marie Curie discovered the radium element in the year 1898.
  2. Radium was given its name from the Latin word “radius”, meaning “ray”.
  3. Radium is the heaviest alkaline earth metal on the periodic table.
  4. The earth’s crust has radium element in the concentration of around 1 part per trillion by weight, which is very very less.
  5. Radium is generally obtained from the radioactive decay of uranium.

Properties of radium

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

Physical properties of radium

  • Radium has a silvery white appearance.
  • Radium has many isotopes and all these isotopes are radioactive in nature. Out of these radioactive isotopes, the most abundant is 226Ra.
  • The melting point and boiling point of radium is 973 K and 2010 K respectively.
  • The density of radium is 5 g/cm3 and its atomic mass is 226 amu.
  • Radium has a BCC crystal structure.

Chemical properties of radium

  • Radium reacts with the atmospheric nitrogen and a radium nitride layer is formed on it. Due to this reaction, its surface becomes dark.
  • Radium also reacts with HCl and forms radium chloride.
  • Radium reacts with water and forms radium hydroxide.

Uses of radium

Radium has no uses nowadays because of its radioactive nature. But the compound of radium (radium bromide) was used in devices like wrist watches, clocks, etc that can glow in the dark.

External resources:

  1. Radium – Element information, properties and uses | Periodic Table. (n.d.). Radium – Element Information, Properties and Uses | Periodic Table. https://www.rsc.org/periodic-table/element/88/radium
  2. Radium – Wikipedia. (2016, July 5). Radium – Wikipedia. https://en.wikipedia.org/wiki/Radium
  3. It’s Elemental – The Element Radium. (n.d.). It’s Elemental – the Element Radium. https://education.jlab.org/itselemental/ele088.html
  4. P. (n.d.). Radium. Radium | Ra – PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/6328144
  5. Radium. (n.d.). NRC Web. https://www.nrc.gov/materials/radium.html
  6. Bondi, A. (1964, March). van der Waals Volumes and Radii. The Journal of Physical Chemistry, 68(3), 441–451. https://doi.org/10.1021/j100785a001
  7. Holden, et al. (2018, December 1). IUPAC Periodic Table of the Elements and Isotopes (IPTEI) for the Education Community (IUPAC Technical Report). Pure and Applied Chemistry, 90(12), 1833–2092. https://doi.org/10.1515/pac-2015-0703
  8. Zhang, et al. (2011, January 11). Corrected Values for Boiling Points and Enthalpies of Vaporization of Elements in Handbooks. Journal of Chemical & Engineering Data, 56(2), 328–337. https://doi.org/10.1021/je1011086
  9. The History of Radium. (n.d.). The History of Radium. http://large.stanford.edu/courses/2021/ph241/lui2/
  10. Periodic Table of Elements: Los Alamos National Laboratory. (n.d.). Periodic Table of Elements: Los Alamos National Laboratory. https://periodic.lanl.gov/88.shtml
  11. Atomic Data for Radium (Ra). (n.d.). Atomic Data for Radium (Ra). https://physics.nist.gov/PhysRefData/Handbook/Tables/radiumtable1.htm
  12. C&EN: IT’S ELEMENTAL: THE PERIODIC TABLE – RADIUM. (n.d.). C&EN: IT’S ELEMENTAL: THE PERIODIC TABLE – RADIUM. https://pubsapp.acs.org/cen/80th/radium.html?
  13. Prohaska, T., et al. (2022, May 1). Standard atomic weights of the elements 2021 (IUPAC Technical Report). Pure and Applied Chemistry, 94(5), 573–600. https://doi.org/10.1515/pac-2019-0603
  14. Haynes, W. M. (Ed.). (2014, June 4). CRC Handbook of Chemistry and Physics. https://doi.org/10.1201/b17118
  15. Kaye, G W.C., & Laby, T H. Tables of physical and chemical constants. 15th Edition. United States.
  16. Sansonetti, J. E., & Martin, W. C. (2005, December). Handbook of Basic Atomic Spectroscopic Data. Journal of Physical and Chemical Reference Data, 34(4), 1559–2259. https://doi.org/10.1063/1.1800011

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