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'''Darmstadtium''' is a [[chemical element]]. It has been named '''ununnilium (Uun)''' or '''eka-platinum''' b Darmstadtium was [[discovery of the chemical elements|first made]] on [[November 9]], [[1994]]. It was made at the [[Gesellschaft ...

...to find out what makes up a sample of a [[substance]] – in other words, a chemical [[analysis]].<ref>http://www.andor.com/learning-academy/absorption-transmis ...es of say, the atmosphere of a far away planet, to the absorption lines of elements we know to exist in a lab. We can then reach a conclusion about what the di ...

:''This article is about the property of [[radioactive]] [[chemical element|elements]]. For the [[video game]], see [[Half-Life (video game)]].'' ...life" was first used when talking about [[radioactive]] [[chemical element|elements]] where the number of [[atom]]s get smaller over time. It is now used in ma ...

...ure of any [[chemical reaction|reactions]] involving the atom and of the [[chemical bond|bonding]] interactions it has with other atoms. Care must be taken to ...he model for the [[octet rule]] which is mostly applicable to main group [[Chemical element|element]]s of the second and third [[periodic table|periods]]. In ...

He also studied [[oxidation]]s of chemical elements. In 1832, he could oxidate <math>SO_2</math> ([[sulfur dioxide]]) to <math> ...

...or1=Otter, Chris|editor2=Stephenson, Kay|title=Salters Advanced Chemistry: Chemical Ideas|publisher=Heinemann|date=2008|edition=Third|isbn=978-0-435631-49-9}}< ...er of [[proton]]s an atom has determines what element it is. However, most elements in nature consist of atoms with different numbers of [[neutron]]s.<ref name ...

...ass''' (symbol: ''m''_a) is the mass of a single [[atom]] of a [[chemical element]]. It includes the masses of the 3 [[subatomic particle]]s that mak ...or1=Otter, Chris|editor2=Stephenson, Kay|title=Salters Advanced Chemistry: Chemical Ideas|publisher=Heinemann|date=2008|edition=Third|isbn=978-0-435631-49-9}}< ...

*The number of horizontal rows of [[chemical element|elements]] in the [[periodic table]]. ...

...ch'' by Donald A. McQuarrie, John D. Simon ISBN 0935702997</ref><ref>''The chemical bond'' 2nd Ed. J.N. Murrell, S.F.A. Kettle, J.M. Tedder ISBN 047190760X</re Chemists study symmetry to explain how [[crystal]]s are made up and how [[chemical reaction|chemicals react]]. The molecular symmetry of the [[reactant]]s hel ...

...and frequencies) of light. Scientists learned that they could identify all elements by the light colors they produce. They just could not figure out how the fr ...of its own, and the brightness differences are always the same for each [[Chemical element|element]]. Why? ...

...ong the bright line strengths were always the same for each sample of an [[chemical element|element]]. ...on for the brightness of the different-colored lines of neon and the other elements could wait. ...

...]] [[plutonium]] after Pluto. This was to keep the tradition of naming new elements after newly discovered planets. For example, [[uranium]] had been named aft ...