One of the 4 new elements – Element 113 – will be the first on the table to be discovered and named by Asian scientists
MANILA, Philippines – Time to replace that periodic table hanging in your chemistry lab.
Four new elements have been officially added to the periodic table of elements, filling the gaps in the 7th row of the chart – and making chemistry textbooks around the world obsolete.
The discovered elements – with atomic numbers 113, 115, 117, and 118 – are now officially verified by the International Union of Pure and Applied Chemistry (IUPAC), the global body responsible for streamlining nomenclature in the scientific field.
All 4 new elements are synthetic elements – they do not occur naturally on Earth and are produced artificially through experiments.
One of the 4 new elements – Element 113 – will be the first on the table to be discovered and named by Asian scientists.
The said element was discovered by a team working at Japan's Riken Institute, where the element was successfully created 3 times between 2004 and 2012.
"IUPAC has announced that Morita's group will be given priority for the discovery of the new element, a privilege that includes the right to propose a name for it," Riken said in a statement.
"I feel grateful that the name will be included in the table for the first time after this recognition," team leader Kosuke Morita, a professor at Japan's Kyushu University, said at a press conference on Thursday, December 31.
Elements 115 and 117, meanwhile, were discovered by a team of scientists from the Joint Institute for Nuclear Research in Russia, and the Lawrence Livermore National Laboratory and Oak Ridge National Laboratory in the United States.
The scientists have been collaborating on this discovery since 2010.
The last new element, Element 118, was discovered by another collaboration between Russia's Joint Institute for Nuclear Research and the US's Lawrence Livermore National Laboratory.
"[The] Dubna–Livermore collaboration started in 2006 is reported as having satisfied the criteria for discovery of element Z=118," IUPAC said in a statement Wednesday, December 30.
The new elements have been given the following temporary names and symbols:
- Element 113: ununtrium, Uut
- Element 115: ununpentium, Uup
- Element 117: ununseptium, Uus
- Element 118: ununoctium, Uuo
"The chemistry community is eager to see its most cherished table finally being completed down to the seventh row," Jan Reedijk, president of IUPAC's Inorganic Chemistry Division, said in the statement.
The teams who discovered the elements have been given the naming rights, and the IUPAC will then check the proposed names "for consistency, translatability into other languages, possible prior historic use for other cases," among others.
The scientific body said the names can come from "mythological concept, a mineral, a place or country, a property, or a scientist."
The final names of the new elements will be decided by the teams within the year. – With reports from Agence France-Presse/Rappler.com
(Periodic table image courtesy Shutterstock)
Published 10:46 PM, January 04, 2016
Updated 10:46 PM, January 04, 2016
A period in the periodic table is one of the horizontal rows. All of those elements in the row have the same number of electron shells. Going across a period, each element has one more proton and is less metallic than its predecessor. Arranged this way, groups of elements in the same column have similar chemical and physical properties, reflecting the periodic law. For example, the alkali metals lie in the first column (group 1) and share similar properties, such as high reactivity and the tendency to lose one electron to arrive at a noble-gas electronic configuration. As of 2016 a total of 118 elements have been discovered and confirmed.
Modern quantum mechanics explains these periodic trends in properties in terms of electron shells. As atomic number increases, shells fill with electrons in approximately the order shown at right. The filling of each shell corresponds to a row in the table.
In the s-block and p-block of the periodic table, elements within the same period generally do not exhibit trends and similarities in properties (vertical trends down groups are more significant). However, in the d-block, trends across periods become significant, and in the f-block elements show a high degree of similarity across periods.
Seven periods of elements occur naturally on Earth. For period 8, which includes elements which may be synthesized after 2016, see the extended periodic table.
A group in chemistry means a family of objects with similarities like different families. There are 7 periods, going horizontally across the periodic table.
The first period contains fewer elements than any other, with only two, hydrogen and helium. They therefore do not follow the octet rule. Chemically, helium behaves as a noble gas, and thus is taken to be part of the group 18 elements. However, in terms of its nuclear structure it belongs to the s block, and is therefore sometimes classified as a group 2 element, or simultaneously both 2 and 18. Hydrogen readily loses and gains an electron, and so behaves chemically as both a group 1 and a group 17 element.
- Hydrogen (H) is the most abundant of the chemical elements, constituting roughly 75% of the universe's elemental mass. Ionized hydrogen is just a proton. Stars in the main sequence are mainly composed of hydrogen in its plasma state. Elemental hydrogen is relatively rare on Earth, and is industrially produced from hydrocarbons such as methane. Hydrogen can form compounds with most elements and is present in water and most organic compounds.
- Helium (He) exists only as a gas except in extreme conditions. It is the second lightest element and is the second most abundant in the universe. Most helium was formed during the Big Bang, but new helium is created through nuclear fusion of hydrogen in stars. On Earth, helium is relatively rare, only occurring as a byproduct of the natural decay of some radioactive elements. Such 'radiogenic' helium is trapped within natural gas in concentrations of up to seven percent by volume.
Period 2 elements involve the 2s and 2porbitals. They include the biologically most essential elements besides hydrogen: carbon, nitrogen, and oxygen.
- Lithium (Li) is the lightest metal and the least dense solid element. In its non-ionized state it is one of the most reactive elements, and so is only ever found naturally in compounds. It is the heaviest primordial element forged in large quantities during the Big Bang.
- Beryllium (Be) has one of the highest melting points of all the light metals. Small amounts of beryllium were synthesised during the Big Bang, although most of it decayed or reacted further within stars to create larger nuclei, like carbon, nitrogen or oxygen. Beryllium is classified by the International Agency for Research on Cancer as a group 1 carcinogen. Between 1% and 15% of people are sensitive to beryllium and may develop an inflammatory reaction in their respiratory system and skin, called chronic beryllium disease.
- Boron (B) does not occur naturally as a free element, but in compounds such as borates. It is an essential plant micronutrient, required for cell wall strength and development, cell division, seed and fruit development, sugar transport and hormone development, though high levels are toxic.
- Carbon (C) is the fourth most abundant element in the universe by mass after hydrogen, helium and oxygen and is the second most abundant element in the human body by mass after oxygen, the third most abundant by number of atoms. There are an almost infinite number of compounds that contain carbon due to carbon's ability to form long stable chains of C—C bonds. All organic compounds, those essential for life, contain at least one atom of carbon; combined with hydrogen, oxygen, nitrogen, sulfur, and phosphorus, carbon is the basis of every important biological compound.
- Nitrogen (N) is found mainly as mostly inertdiatomic gas, N2, which makes up 78% of the Earth's atmosphere by volume. It is an essential component of proteins and therefore of life.
- Oxygen (O) comprising 21% of the atmosphere by volume and is required for respiration by all (or nearly all) animals, as well as being the principal component of water. Oxygen is the third most abundant element in the universe, and oxygen compounds dominate the Earth's crust.
- Fluorine (F) is the most reactive element in its non-ionized state, and so is never found that way in nature.
- Neon (Ne) is a noble gas used in neon lighting.
All period three elements occur in nature and have at least one stable isotope. All but the noble gas argon are essential to basic geology and biology.
Period 4 includes the biologically essential elements potassium and calcium, and is the first period in the d-block with the lighter transition metals. These include iron, the heaviest element forged in main-sequence stars and a principal component of the earth, as well as other important metals such as cobalt, nickel, and copper. Almost all have biological roles.
Completing the fourth period are the post-transition metalszinc and gallium, the metalloidsgermanium and arsenic, and the nonmetalsselenium, bromine, and krypton.
Period 5 has the same number of elements as period 4 and follows the same general structure but with one more post transition metal and one fewer nonmetal. Of the three heaviest elements with biological roles, two (molybdenum and iodine) are in this period; tungsten, in period 6, is heavier, along with several of the early lanthanides. Period 5 also includes technetium, the lightest exclusively radioactive element.
Period 6 is the first period to include the f-block, with the lanthanides (also known as the rare earth elements), and includes the heaviest stable elements. Many of these heavy metals are toxic and some are radioactive, but platinum and gold are largely inert.
All elements of period 7 are radioactive. This period contains the heaviest element which occurs naturally on earth, plutonium. All of the subsequent elements in the period have been synthesized artificially. Whilst five of these (from americium to einsteinium) are now available in macroscopic quantities, most are extremely rare, having only been prepared in microgram amounts or less. Some of the later elements have only ever been identified in laboratories in quantities of a few atoms at a time.
Although the rarity of many of these elements means that experimental results are not very extensive, periodic and group trends in behaviour appear to be less well defined for period 7 than for other periods. Whilst francium and radium do show typical properties of groups 1 and 2 respectively, the actinides display a much greater variety of behaviour and oxidation states than the lanthanides. These peculiarities of period 7 may be due to a variety of factors, including a large degree of spin-orbit coupling and relativistic effects, ultimately caused by the very high positive electrical charge from their massive atomic nuclei.
Main article: Extended periodic table
No element of the eighth period has yet been synthesized. A g-block is predicted. It is not clear if all elements predicted for the eighth period are in fact physically possible. There may therefore be no eighth period.
- ^Palmer, David (November 13, 1997). "Hydrogen in the Universe". NASA. Retrieved 2008-02-05.
- ^"hydrogen". Encyclopædia Britannica. 2008.
- ^"Helium: physical properties". WebElements. Retrieved 2008-07-15.
- ^"Helium: geological information". WebElements. Retrieved 2008-07-15.
- ^Cox, Tony (1990-02-03). "Origin of the chemical elements". New Scientist. Retrieved 2008-07-15.
- ^"Helium supply deflated: production shortages mean some industries and partygoers must squeak by". Houston Chronicle. 2006-11-05.
- ^Brown, David (2008-02-02). "Helium a New Target in New Mexico". American Association of Petroleum Geologists. Retrieved 2008-07-15.
- ^Lithium at WebElements.
- ^"IARC Monograph, Volume 58". International Agency for Research on Cancer. 1993. Retrieved 2008-09-18.
- ^Information about chronic beryllium disease.
- ^"Functions of Boron in Plant Nutrition"(PDF). U.S. Borax Inc.
- ^Blevins, Dale G.; Lukaszewski, Krystyna M. (1998). "Functions of Boron in Plant Nutrition". Annual Review of Plant Physiology and Plant Molecular Biology. 49: 481–500. doi:10.1146/annurev.arplant.49.1.481. PMID 15012243.
- ^Ten most abundant elements in the universe, taken from The Top 10 of Everything, 2006, Russell Ash, page 10. Retrieved October 15, 2008.
- ^Chang, Raymond (2007). Chemistry, Ninth Edition. McGraw-Hill. p. 52. ISBN 0-07-110595-6.
- ^Freitas Jr., Robert A. (1999). Nanomedicine. Landes Bioscience. Tables 3-1 & 3-2. ISBN 1-57059-680-8.
- ^ ab"Structure and Nomenclature of Hydrocarbons". Purdue University. Retrieved 2008-03-23.
- ^ abcAlberts, Bruce; Alexander Johnson; Julian Lewis; Martin Raff; Keith Roberts; Peter Walter. Molecular Biology of the Cell. Garland Science.