What is the most common oxidation state of first transition series?

The most common oxidation states of cerium are

Which is the most common oxidation state of lanthanoids?

What is the common oxidation state of Cu, Ag and Au?

The most common oxidation states of 3d series elements

State the common oxidation state of : Actinides

What is the highest oxidation state shown by a transition element.

Describe the trend in I.E., electrode potential, atomic radii and oxidation states of elements of first transition series.

Write all the common oxidation states of halogens:

Most common oxidation state of lanthanoids is ul(+5)

What are common oxidation states of group 15 elements?