Actinoid -

The actinoids (or actinides) are a series of ranging from atomic numbers 89 to 103. Named after their first member, actinium , these elements form the lower row of the f-block. Atomic Range: Actinium ( ) to Lawrencium (

Unlike their "sister" series (the lanthanoids), actinoids show a much wider range of oxidation states, making their chemistry highly complex. actinoid

Their chemical behavior is defined by electrons progressively filling the 5f orbital. The actinoids (or actinides) are a series of