Roentgenium – Periodic Table (Element Information & More)

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Roentgenium (Rg) element Periodic table

This is a SUPER easy guide on Roentgenium element.

In fact, the table mentioned below is the perfect information box (Which gives you every single detail about the Roentgenium element in Periodic table.)

So if you want to know anything about Roentgenium element, then this guide is for you.

Let’s dive right into it!

Roentgenium Element (Rg) Information

AppearanceSilvery (predicted)
State (at STP)Solid (predicted)
Position in Periodic tableRoentgenium in periodic table (Position)
Group: 11, Period: 7, Block: d
CategorySynthetic element
Atomic number or 
Protons		111
Neutrons161
Electrons111
SymbolRg
Atomic mass of Roentgenium (most stable isotope) Roentgenium (Rg) atomic mass
282 u
Electrons arrangement

or 

Bohr model		Bohr model of roentgenium (Electrons arrangement in roentgenium, Rg)
2, 8, 18, 32, 32, 17, 2
Electronic configuration[Rn] 5f14 6d9 7s2
Crystal structure (predicted)crystal structure of roentgenium
BCC (body centered cubic)
Density22-24 g/cm3
CAS number54386-24-2

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Roentgenium in Periodic table

Roentgenium element is in group 11 and in period 7 of the Periodic table. Roentgenium is the d-block element and it is a radioactive synthetic element.

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Why is Roentgenium in Period 7?

Why is Roentgenium in Period 7

Let me ask you a question.

How many shells does a roentgenium atom have?

It’s 7. Right? 

You have already seen the bohr model of roentgenium atom in the above table.

From the Bohr model, it can be found that the number of orbits or shells in roentgenium is 7. Hence, as roentgenium has 7 orbits, it lies in period 7 of the Periodic table.

Why is Roentgenium in d-block?

Why is Roentgenium in d-block

Before knowing this reason, first of all I want to ask you a simple question.

How can you determine the blocks-wise position of elements?

The simple answer: The elements will lie in the s, p, d or f block will completely depend upon the subshell in which the last electron will enter.

For example; the electron configuration of roentgenium is [Rn] 5f14 6d9 7s2. 

So the last electron of roentgenium enters the d-subshell or d-orbital. 

Hence, roentgenium is the d-block element.

5 facts about Roentgenium

Interesting facts about roentgenium element are mentioned below.

  1. The element was given the name “Roentgenium” to honor the physicist Wilhelm Rontgen.
  2. Roentgenium was discovered by Peter Armbruster and Gottfried Münzenberg in 1994.
  3. Roentgenium is artificially prepared in a laboratory and it is not available naturally.
  4. There are 9 known isotopes of roentgenium and all those isotopes are radioactive in nature.
  5. The most stable isotope of roentgenium is 282Rg, which has a half-life of only 100 seconds.

Properties of Roentgenium

The physical and chemical properties of roentgenium element are mentioned below.

  • The roentgenium element is extremely radioactive and has a very short half life.
  • The calculated atomic mass of the most stable isotope of roentgenium is 282 u and its predicted density is 22-24 g/cm3.
  • The predicted phase of roentgenium is solid at STP.
  • The predicted crystal structure of roentgenium is BCC (body centered cubic).
  • The most stable oxidation state of  roentgenium is predicted to be +3. Besides this, it can also show other oxidation states like +1, +5 and +7.

Uses of Roentgenium

Roentgenium is generally used for scientific research work in chemistry. There is no commercial use of roentgenium due to its radioactive nature and scarcity.

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External resources:

  1. Roentgenium – Wikipedia. (2013, October 4). Roentgenium – Wikipedia. https://en.wikipedia.org/wiki/Roentgenium
  2. Roentgenium – Element information, properties and uses | Periodic Table. (n.d.). Roentgenium – Element Information, Properties and Uses | Periodic Table. https://www.rsc.org/periodic-table/element/111/roentgenium
  3. P. (n.d.). Roentgenium | Rg (Element) – PubChem. Roentgenium | Rg (Element) – PubChem. https://pubchem.ncbi.nlm.nih.gov/element/Roentgenium
  4. It’s Elemental – The Element Roentgenium. (n.d.). It’s Elemental – the Element Roentgenium. https://education.jlab.org/itselemental/ele111.html

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