Periodic Table > Livermorium
 

Terminology


Allotropes
Some elements exist in several different structural forms, these are called allotropes.


For more information on Murray Robertson’s image see Uses and properties facts below.

 

Fact box terminology


Group
Elements appear in columns or ‘groups’ in the periodic table. Members of a group typically have similar properties and electron configurations in their outer shell.


Period
Elements are laid out into rows or ‘periods’ so that similar chemical behaviour is observed in columns.


Block
Elements are organised into blocks by the orbital type in which the outer electrons are found. These blocks are named for the characteristic spectra they produce: sharp, principal, diffuse, and fundamental.


Atomic Number
The number of protons in the nucleus.


Atomic Radius/non -bonded (Å)
based on Van der Waals forces (where several isotopes exist, a value is presented for the most prevalent isotope). These values were calculated using a multitude of methods including crystallographic data, gas kinetic collision cross sections, critical densities, liquid state properties, for more details please refer to the CRC Handbook of Chemistry and Physics.


Electron Configuration
The arrangements of electrons above the last (closed shell) noble gas.


Isotopes
Elements are defined by the number of protons in its centre (nucleus), whilst the number of neutrons present can vary. The variations in the number of neutrons will create elements of different mass which are known as isotopes.


Melting Point (oC)
The temperature at which the solid-liquid phase change occurs.


Melting Point (K)
The temperature at which the solid-liquid phase change occurs.


Melting Point (oF)
The temperature at which the solid-liquid phase change occurs.


Boiling Point (oC)
The temperature at which the liquid-gas phase change occurs.


Boiling Point (K)
The temperature at which the liquid-gas phase change occurs.


Boiling Point (oF)
The temperature at which the liquid-gas phase change occurs.


Sublimation
Elements that do not possess a liquid phase at atmospheric pressure (1 atm) are described as going through a sublimation process.


Density (g cm-3)
Density is the mass of a substance that would fill 1 cm3 at room temperature.


Relative Atomic Mass
The mass of an atom relative to that of Carbon-12. This is approximately the sum of the number of protons and neutrons in the nucleus. Where more than one isotope exists the value given is the abundance weighted average.


Key Isotopes (% abundance)
An element must by definition have a fixed number of protons in its nucleus, and as such has a fixed atomic number, however variants of an element can exist with differing numbers of neutrons, and hence a different atomic masses (e.g. 12C has 6 protons and 6 neutrons and 13C has 6 protons and 7 neutrons).


CAS number
The Chemical Abstracts Service registry number is a unique identifier of a particular chemical, designed to prevent confusion arising from different languages and naming systems (where several isotopes exist, a value is presented for the most prevalent isotope).

Fact box

 
Group 16  Melting point Unknown 
Period Boiling point Unknown 
Block Density (g cm-3) Unknown 
Atomic number 116  Relative atomic mass [293]  
State at 20°C Solid  Key isotopes 293Lv 
Electron configuration [Rn] 5f146d107s27p4  CAS number 54100-71-9 
ChemSpider ID - ChemSpider is a free chemical structure database
 

Uses and properties terminology


Image Explanation

Murray Robertson is the artist behind the images which make up Visual Elements. This is where the artist explains his interpretation of the element and the science behind the picture.


Natural Abundance

Where this element is most commonly found in nature.


Biological Roles

The elements role within the body of humans, animals and plants. Also functionality in medical advancements both today and years ago.


Appearance

The description of the element in its natural form.

Uses and properties

 
Image explanation
The image features an abstract form inspired by images from NIF Target Chamber at the Lawrence Livermore National Laboratory. The two colours in the image represent the two elements that collide to form livermorium – calcium and curium.
Appearance
A highly radioactive metal, of which only a few atoms have ever been made.
Uses
At present, it is only used in research.
Biological role
It has no known biological role.
Natural abundance
Livermorium does not occur naturally. It is made by bombarding curium atoms with calcium. The most stable isotope has a half-life of about 53 milliseconds.
 
Atomic data terminology

Atomic radius/non -bonded (Å)
Based on Van der Waals forces (where several isotopes exist, a value is presented for the most prevalent isotope). These values were calculated using a multitude of methods including crystallographic data, gas kinetic collision cross sections, critical densities, liquid state properties,for more details please refer to the CRC Handbook of Chemistry and Physics.


Electron affinity (kJ mol-1)
The energy released when an additional electron is attached to the neutral atom and a negative ion is formed (where several isotopes exist, a value is presented for the most prevalent isotope). *


Electronegativity (Pauling scale)
The degree to which an atom attracts electrons towards itself, expressed on a relative scale as a function bond dissociation energies, Ed in eV. χA - χB =(eV)-1/2sqrt(Ed(AB)-[Ed(AA)+Ed(BB)]/2), with χH set as 2.2 (where several isotopes exist, a value is presented for the most prevalent isotope).


1st Ionisation energy (kJ mol-1)
The minimum energy required to remove an electron from a neutral atom in its ground state (where several isotopes exist, a value is presented for the most prevalent isotope).


Covalent radius (Å)
The size of the atom within a covalent bond, given for typical oxidation number and coordination (where several isotopes exist, a value is presented for the most prevalent isotope). ***

Atomic data

 
Atomic radius, non-bonded (Å) Unknown Covalent radius (Å) 1.75
Electron affinity (kJ mol-1) Unknown Electronegativity
(Pauling scale)
Unknown
Ionisation energies
(kJ mol-1)
 
1st
-
2nd
-
3rd
-
4th
-
5th
-
6th
-
7th
-
8th
-
 

Mining/Sourcing Information

Data for this section of the data page has been provided by the British Geological Survey. To review the full report please click here or please look at their website here.


Key for numbers generated


Governance indicators

1 (low) = 0 to 2

2 (medium-low) = 3 to 4

3 (medium) = 5 to 6

4 (medium-high) = 7 to 8

5 (high) = 9


Reserve distribution (%)

1 (low) = 0 to 30 %

2 (medium-low) = 30 to 45 %

3 (medium) = 45 to 60 %

4 (medium-high) = 60 to 75 %

5 (high) = 75 %

(Where data are unavailable an arbitrary score of 2 was allocated. For example, Be, As, Na, S, In, Cl, Ca and Ge are allocated a score of 2 since reserve base information is unavailable. Reserve base data are also unavailable for coal; however, reserve data for 2008 are available from the Energy Information Administration (EIA).)


Production Concentration

1 (low) = 0 to 30 %

2 (medium-low) = 30 to 45 %

3 (medium) = 45 to 60 %

4 (medium-high) = 60 to 75 %

5 (high) = 75 %


Crustal Abundance

1 (low) = 100 to 1000 ppm

2 (medium-low) =10 to 100 ppm

3 (medium) = 1 to 10 ppm

4 (medium-high) = 0.1 to 1 ppm

5 (high) = 0.1 ppm

(Where data are unavailable an arbitrary score of 2 was allocated. For example, He is allocated a score of 2 since crustal abundance data is unavailable.)


Explanations for terminology


Crustal Abundance (ppm)

The abundance of an element in the Earth's crust in parts-per-million (ppm) i.e. The number of atoms of this element per 1 million atoms of crust.


Sourced

The country with the largest reserve base.


Reserve distribution (%)

This is a measure of the spread of future supplies, recording the percentage of a known resource likely to be available in the intermediate future (reserve base) located in the top three countries.


Production Concentrations

This reports the percentage of an element produced in the top three countries. The higher the value, the larger risk there is to supply.


Political stability of top producer

The World Bank produces a global percentile rank of political stability. The scoring system is given below, and the values for all three production countries were summed.


Relative Supply Risk Index

The Crustal Abundance, Reserve distribution (%), Production Concentration and Governance Factor scores are summed and then divided by 2, to provide an overall Relative Supply Risk Index.

Supply risk

 
Relative supply risk Unknown
Crustal abundance (ppm) Unknown
Recycling rate (%) Unknown
Substitutability Unknown
Production concentration (%) Unknown
Reserve distribution (%) Unknown
Top 3 producers
  • Unknown
Top 3 reserve holders
  • Unknown
Political stability of top producer Unknown
Political stability of top reserve holder Unknown
 

Oxidation states and isotopes


Key for Isotopes


Half Life
  y years
  d days
  h hours
  m minutes
  s seconds
Mode of decay
  α alpha particle emission
  β negative beta (electron) emission
  β+ positron emission
  EC orbital electron capture
  sf spontaneous fission
  ββ double beta emission
  ECEC double orbital electron capture

Terminology


Common Oxidation states
The oxidation state of an atom is a measure of the degree of oxidation of an atom. It is defined as being the charge that an atom would have if all bonds were ionic. Free atoms have an oxidation state of 0, and the sum of oxidation numbers within a substance must equal the overall charge.


Important Oxidation states
The most common oxidation states of an element in its compounds.


Isotopes
Elements are defined by the number of protons in its centre (nucleus), whilst the number of neutrons present can vary. The variations in the number of neutrons will create elements of different mass which are known as isotopes.

Oxidation states and isotopes

 
Common oxidation states
Isotopes Isotope Atomic mass Natural abundance (%) Half life Mode of decay
  293Lv 293 - 0.06 s  α 
 

Pressure and temperature - advanced terminology


Specific heat capacity (J kg-1 K-1)

Specific heat capacity is the amount of energy needed to change the temperature of a kilogram of a substance by 1 K.


Young's modulus (GPa)

Young's modulus is a measure of the stiffness of a substance, that is, it provides a measure of how difficult it is to extend a material, with a value given by the ratio of tensile strength to tensile strain.


Shear modulus (GPa)

The shear modulus of a material is a measure of how difficult it is to deform a material, and is given by the ratio of the shear stress to the shear strain.


Bulk modulus (GPa)

The bulk modulus is a measure of how difficult to compress a substance. Given by the ratio of the pressure on a body to the fractional decrease in volume.


Vapour Pressure (Pa)

Vapour pressure is the measure of the propensity of a substance to evaporate. It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system.

Pressure and temperature data – advanced

 
Specific heat capacity
(J kg-1 K-1)
Unknown Young's modulus (GPa) Unknown
Shear modulus (GPa) Unknown Bulk modulus (GPa) Unknown
Vapour pressure  
Temperature (K)
400 600 800 1000 1200 1400 1600 1800 2000 2200 2400
Pressure (Pa)
- - - - - - - - - - -
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History

Four isotopes of this element have been produced and they have mass numbers 290-293. The longest-lived is 293 with a half-life of 61 milliseconds.


There were several attempts to make element 116 but all were unsuccessful until 2000 when researchers at the Joint International Nuclear Research (JINR) in Russia, led by Yuri Oganessian, Vladimir Utyonkov, and Kenton Moody observed it. Because the discovery was made using essential target material supplied by the Lawrence Livermore National Laboratory (LLNL) in the USA, it was decided to name it after that facility.


In1999, the Lawrence Berkeley National Laboratory in California had announced the discovery of element 116 but then it was discovered that evidence had simply been concocted by one of their scientists, and so the claim had to be withdrawn.

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Podcasts

Listen to Livermorium Podcast
Transcript :

Chemistry in its element - Livermorium


Since this podcast was first published, the name of this element has been ratified by the International Union of Pure and Applied Chemistry (Iupac). It is to be called Livermorium (symbol Lv) in honour of the Lawrence Livermore National Laboratory in California, home of the US end of the collaborative team and a stalwart of nuclear and heavy-element research.

(Promo) 

You're listening to Chemistry in its element brought to you by Chemistry World, the magazine of the Royal Society of Chemistry 

(End promo) 

Meera Senthilingam 

This week the chemist's that are seeking fame. Here's Andrea Sella 

Andrea Sella

We live in an age when everyone is just gagging to be 'famous'. Andy Warhol, of course, pointed out that everyone was likely to be famous for 15 minutes. But the real question is, if you're a chemist, or a scientist generally, what does it take to become famous? How do earn the adulation of the masses? And if not the masses, at least of your peers? 

 

You'd think a Nobel prize would do it. But you'd be surprised how few of them anyone can actually remember, apart from a few early 20th  century heroes. And to have an element named after you need to be dead. So that seems quite pointless.

 

What if you discovered a new element? For about 70 years, ever since plutonium slipped out of a nuclear reaction, the search has been on to make ever heavier and more exotic elements to add to our periodic table. And I emphasise the word 'make' because it is no longer a question of finding a rock and extracting from it some mysterious substance that does not fit the description of anything that has come before. No, you actually have to make it from scratch. 

 

So how do you make an element? Well new atoms of, admittedly old, elements, are being made all the time. Nuclear fusion of hydrogen is the fundamental process that powers stars. But as stars age and steadily run out of hydrogen they gradually start fusing heavier nuclei and it is then possible to make ever heavier atoms.   It's brutally difficult because you have to get past the huge positive charges of the two nuclei to get them to fuse. Stars can do this nucleosynthesis up to iron. Unfortunately that's where things end. 

 

After that the way to make anything heavier is by adding neutrons. Because the neutron has no charge it can sneak quietly into the nucleus. The neutron can then add to the total mass count, and the nucleus can then decay by spitting out an electron to give you something that is one place higher along in the periodic table. And repeating this process laboriously - one step forward, one step back - will take you all the way out towards uranium, which at atomic number 92 is about as high as one can find lying around in universe. 

 

But can one go beyond? The answer turns out to be yes. Teams in the US, Germany, Japan and Russia have been hard at work doing it. And the process is incredibly difficult. Essentially what they do is strip atoms down to their nuclei and then accelerate them to phenomenal speeds using a particle accelerator, and then slam these ions into a target. So for example the element lawrencium was made by bashing a californium target with naked boron nuclei. 

 

This is not work for the lone experimenter working in a shed somewhere. These are experiments of extraordinary subtlety and complexity. And the problem is not just making the new element but also figuring out what you've got at the end. The problem is that you only make a few atoms at a time and these products tend to be spectacularly unstable so you sometimes have only a few milliseconds in which to work out what you've got. It's complex. It's expensive. And very, very clever. And each new atom really is a whole new chemical world to explore. Can it be any wonder that it attracts fortune seekers?

 

In June 1999 the Lawrence Berkeley Lab in California, one of the few places in the world that does this sort of work announced in the journal Physical Review Letters that they had succeeded in making ununhexium and ununoctium, which in plain English means elements 116 and 118, by bashing a lead target with krypton nuclei. Huge excitement followed because these were by far the heaviest elements ever made. It seemed a real breakthrough. The method they had used was also a departure from previous work - a new strategy that had gone spectacularly well. The secretary of energy, whose department had funded the work noted that four of the senior members of the team were foreign said 'this stunning discovery which opens the door to further insights into the structure of the atomic nucleus also underscores the value of foreign visitors and what the country would lose if there were a moratorium on foreign visitors at our national labs. Scientific excellence doesn't recognise national boundaries, and we will damage our ability to perform world-class science if we cut off our laboratories from the rest of the world.'

 

The problem was however, that no one else could repeat the work. Labs in Germany and Russia reported that they got different results. A major process of soul-searching started in California and the data began to be picked over in great detail. A painful investigation concluded that one of the team leaders Victor Ninov, a Bulgarian national, had fabricated the crucial data. Confronted with the evidence, Ninov denied everything. But in Germany, irregularities came to light in the data associated with an earlier discovery he had been involved with - that of elements 111 and 112.   Ninov was fired. The Berkeley led group were then forced to do the unthinkable - to publish a retraction, the author list being one name shorter than the original paper. It was the scientific equivalent of hara kiri.

 

But did element 116 really not exist? In 2000, the rival group in Russia reported having made a single atom of element 116 and within 3 years had succeeded in making more atoms of two different isotopes of this element. 118, on the other hand, had to wait until 2002 for successful synthesis by a route that differed from that used by the Americans. So 116 and 118 are real, and their properties are slowly being mapped out even as we speak. But does anyone remember the names of the people who are the rightful discoverers? Does the name Oganessian ring a bell? Probably not.

 

It's more likely that you remember the name of Victor Ninov, the man at the centre of the storm. Perverse, isn't it? But it's the way of the world. Fame, even in science, is a fickle mistress. 

 

Meera Senthilingam 

Perhaps the net aim then, rather than finding an element could be to find a way to preserve these legacies. Just a thought. That was University College London's Andrea Sella with the fundamental not famous chemistry of elements 116 and 118. Now next week a two faced element.

David Read

Sodium, like most elements in the periodic table could be said to have a dual personality. On one side it is an essential nutrient for most living things, and yet, due to its reactive nature is also capable of wreaking havoc if you happen to combine it with something you shouldn't.

As such sodium is found naturally only in compounds and never as the free element. Even so it is highly abundant, accounting for around 2.6 per cent of the earths crust by weight.

Meera Senthilingam

And to find out some of the beneficial, as well as lethal roles of sodium - as well as the mystery behind it being given the symbol Na, join David Read from the University of Southampton in next week's Chemistry in its element.

(Promo) 

Chemistry in its element is brought to you by the Royal Society of Chemistry and produced by thenakedscientists dot com. There's more information and other episodes of Chemistry in its element on our website at chemistryworld dot org forward slash elements. 

(End promo) 

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References

 
Images:  Visual Elements © Murray Robertson 2011
Mining and Sourcing data:  British Geological Survey – natural environment research council.
Text:  John Emsley Nature’s Building Blocks: An A-Z Guide to the Elements, Oxford University Press, 2nd Edition, 2011.
Additional information for platinum, gold, neodymium and dysprosium obtained from Material Value Consultancy Ltd www.matvalue.com
Data: CRC Handbook of Chemistry and Physics, CRC Press, 92nd Edition, 2011.
G. W. C. Kaye and T. H. Laby Tables of Physical and Chemical Constants, Longman, 16th Edition, 1995.
Members of the RSC can access these books through our library.