Comprehension Passage
Elements of the 2nd and 3rd transition series show lots of similarities in their chemical and physical properties. The atomic size of Zr and Hf are almost the same. This is because of the presence of lanthanides as the inter-transition element.
Why is the purification of Actinides difficult?
1
Because all are radioactive
2
Because all have similar physical and chemical properties
3
Because they are present in a very small amount
4
None of these