Chapter 39, Problem 17A

(a)

To determine

The definition of transuranic elements.

Explanation of Solution

Introduction:

The nucleus of the radioactive element is very heavy and this element tries to attain the stability by radioactive decay process.

The elements beyond the Uranium in the periodic table are called transuranic element. The atomic number of the Uranium is 92, so all the elements having the atomic number greater than 92 in the periodic table are the transuranic element. These elements are formed by the process called as transmutation.

Conclusion:

Thus, the elements beyond the Uranium in the periodic table are called transuranic element.

(b)

To determine

The reason for not having the ore deposit of the transuranic elements on the Earth.

Explanation of Solution

Introduction:

The transuranic elements are formed by the process of transmutation.

The ore deposit of a radioactive element on Earth depends on the half-life of the element. If the half-life becomes very small then the radioactive element cannot exist due to very low amount.

The half-lives of all the transuranic elements are very less due to unstable nucleus, so these elements are short lived. These are formed by the artificial methods in the laboratory.

Conclusion:

Thus, the transuranic elements do not have any ore deposit on Earth due to very short half-life of transuranic elements.