Q28 of 53 Page 234

What are inner transition elements? Decide which of the following atomic numbers are the atomic numbers of the inner transition elements: 29, 59, 74, 95, 102, 104.

the inner transition elements are those in which the last electron enters the f- subshell. The lanthanoids atomic number 58-71 and actinoids 90-103.

The atomic numbers 59, 95 and 102 are inner transition elements.


More from this chapter

All 53 →
26

Indicate the steps in the preparation of:

(i) K2Cr2O7 from chromite ore. (ii) KMnO4 from pyrolusite ore.

 27

What are alloys? Name an important alloy which contains some of the lanthanoid metals. Mention its uses.

 29

The chemistry of the actinoid elements is not so smooth as that of the lanthanoids. Justify this statement by giving some examples from the oxidation state of these elements.

 30

Which is the last element in the series of the actinoids? Write the electronic configuration of this element. Comment on the possible oxidation state of this element.