Amphoteric Elements : An element one or more of whose oxides unite with water to form hydroxides that may act as acids or as bases
The thirty rare earth elements are composed of the lanthanide and actinide series. One element of the lanthanide series and most of the elements in the actinide series are called trans-uranium, which means synthetic or man-made. All of the rare earth metals are found in group 3 of the periodic table, and the 6th and 7th periods. The Rare Earth Elements are made up of two series of elements, the Lanthanide and Actinide Series.The Rare Earth Elements are: Lanthanide Series | | Actinide Series |
* Lanthanum * Cerium * Praseodymium * Neodymium * Promethium * Samarium * Europium * Gadolinium * Terbium * Dysprosium * Holmium * Erbium * Thulium * Ytterbium * Lutetium | | * Actinium * Thorium * Protactinium * Uranium * Neptunium * Plutonium * Americium * Curium * Berkelium * Californium * Einsteinium * Fermium * Mendelevium * Nobelium * Lawrencium | |
An inert gas is a non-reactive gas used during chemical synthesis, chemical analysis, or preservation of reactive materials. Inert gases are selected for specific settings for which they are functionally inert since the cost of the gas and the cost of purifying the gas are usually a consideration. Neon and argon are the most common inert gases for use in chemistry and archival settings.
Unlike noble gases, an inert gas is not necessarily elemental and is often a compound gas. Like the noble gases the tendency for non-reactivity is due to the valence, the outermost electron shell, being complete in all the inert gases. This is a tendency, not a rule, as noble gases and other "inert" gases can react to form compounds.
In marine applications, inert gas refers to gases with a low content of oxygen that are used to fill void spaces in and around tanks for explosion protection. There are two types of inert gas which are...