Tarnish

Tarnish is a term given as a property of elements where the shiney surface easily loses its shine due to the metal reacting with oxygen in oxidation

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The Lanthanides of the Expanded Periodic Table

The lanthanides are a series of chemicals in the expanded periodic table that have an expanded number of orbitals beyond that of the transition metals. The lanthanides are mostly soft metals with their hardness increasing across the period. Whilst they are metals and can conduct electricity the lanthanides have a relatively high resistivity.

The Actinides of the Expanded Periodic Table

The Actinides also known as the actinoids are a set of elements in the final period of the periodic table from elements 89 to 103. They are a series of radioactive elements with similar properties.