Practicing Success
Case: Read the passage and answer the following questions The f-block consists of the two series, lanthanoids (the fourteen elements following lanthanum) and actinoids (the fourteen elements following actinium). Because lanthanum closely resembles the lanthanoids, it is usually included in any discussion of the lanthanoids for which the general symbol Ln is often used. They have only one stable oxidation state and their chemistry provides an excellent opportunity to examine the effect of small changes in size and nuclear charge along a series of otherwise similar elements. |
Which of the following statement about lanthanides is false? |
All lanthanides are highly dense metals Most common oxidation state of lanthanides are +3 Lanthanides are separated from one another by the ion exchange method All of them are true |
All of them are true |
All of the above statements are true about lanthanides. |