Question

Which is the first man-made element?
A. Sc
B. Os
C. Tc
D. Zr

Answer 1

In nature a lot of elements are available and they are called naturally occurring elements and few elements are prepared by man and they are called artificial or man-made elements. Maximum man-made elements are radioactive in nature.

Complete answer:
- In the question it is asked what the first man-made element is among the given options.
- Coming to given options. Option A, Sc.
- Scandium (Sc) is a chemical element called transition metal. So, option A is incorrect.
- Coming to the given option B. Osmium (Os) with an atomic number 76. It is bluish white transition metal present in d-block. Osmium is hard and brittle in nature. It is mostly found in trace amounts in alloys. So, option B is incorrect.
- Coming to option C, Tc. Technetium (Tc) is the element present below of uranium and it is not present on earth. Technetium is a man-made (synthetic) produced and particle accelerator. So, option C is correct.
- Coming to option D, Zr. The atomic number of Zirconium (Zr) is 40 and present in group IV. It is present in earth’s crust and corrosion resistant in nature.

Therefore the correct option is C, Technetium.

Note:
Generally man-made elements are radioactive in nature and to gain stability they emit radiation to get a stable nucleus. The emitted radiation may contain alpha, beta and gamma particles. Technetium is the first man-made element.