Question

What is the example of silvery white metals?

Answer 1

Hint : The lanthanides and actinides are groups of elements in the periodic table. They are the elements that are often listed below the main section of the periodic table. There are thirty total elements in the lanthanides and actinides. They are often called the “inner transition metals”.

Complete Step By Step Answer:
The lanthanides were discovered in1787 in Sweden, because at that time some unusual mineral was found named gadolinite. Which was later separated into various elements. After various experiments for years, it was proved that it contains 14 elements in between lanthanum and hafnium.
Like any other series, even lanthanum has some common similar characteristics. These are, the physical properties, the dominance of +3 oxidation state. Usually found in the crystalline stage. They can also show+ to +4 oxidation state, but majorly +3 is there. They have a tendency to decrease coordination numbers across the series. The ionic complexes undergo rapid ligand –exchange. The lanthanides and actinides are groups of elements in the periodic table. These are silvery white metal that tarnish when exposed to air, forming their oxides. Relatively soft metals hardness increases somewhat with higher atomic number. They are very reactive. They liberate $H_2$ slowly from reacting with water in cold conditions. It is an exothermic reaction.it burns in air easily.

Note :
These are often used in scientific and industrial uses. Their compounds are used as catalysts in the production of petroleum and synthetic products. Lanthanides are used in magnets, lasers, motion picture projection and even in X ray intensifying screens.