Which elements are actinide series

As the atomic number of these elements increases the ionic and atomic size decreases. Both Lanthanides and Actinides have considerable magnetic properties. Differences Between Lanthanides and Actinides. The energy that binds this atom that are 4F is comparatively less than of actinides which is 5F electrons. The shielding of the 5F electrons is also less when compared to that of 4F electrons. It is very easy to explain the paramagnetic properties of Lanthanides.

On the other hand, in the case of Actinides, one cannot easily explain all the paramagnetic properties. Most of the Lanthanides are non-Radioactive except for Promethium. All the elements in the Actinide series are Radioactive in nature.

There are several oxocation of the elements in Actinides series whereas there is no oxocation in Lanthanides. The compounds that are formed by Actinides are very basic in nature as oppose to the compounds found by Lanthanides. The lanthanides and actinides are often called inner transition metals. Properties of Actinides:. The actinides are Metals which are typical in nature. The actinides are soft, shiny, silver in color and have a good density and plasticity. Some of the actinides can also be cut with the help of a simple knife.

Thorium has a similar hardness to soft steel and can be heated to roll into sheets or pull in to a wire. The properties of elements in the actinide series are the same as D block. Members of the actinide series can lose multiple electrons to form a variety of different ions.

All actinides are radioactive, paramagnetic, and, with the exception of actinium, have several crystalline phases. All actinides are pyrophoric, especially when finely divided i. The melting point of actinides does not have a clear dependence on the number of f electrons. Like the lanthanides, all actinides are highly reactive with halogens and chalcogens; however, the actinides react more easily.

Actinides, especially those with a small number of 5f electrons, are prone to hybridization. This is explained by the similarity of the electron energies at the 5f, 7s, and 6d subshells. Most actinides exhibit a larger variety of valence states. Boundless vets and curates high-quality, openly licensed content from around the Internet.

This particular resource used the following sources:. Skip to main content. Helmenstine, Anne Marie, Ph. Actinides List of Elements. Properties and Reactions of the Actinide Series of Elements. Transition Metals: List and Properties. Element Families of the Periodic Table. Transition Metals and the Properties of the Element Group. Metals Versus Nonmetals - Comparing Properties. Your Privacy Rights. To change or withdraw your consent choices for ThoughtCo.

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