Question

Which one of the following is the man made element?
(A) Fe
(B) Ru
(C) The
(D) none

Answer 1

Hint: All the man made elements are of a high atomic number.They are mostly radioactive.After uranium, the man-made elements exist. Here, Iron is a metal with a comparatively lower atomic number, and also all the elements mentioned here appear before uranium in the periodic table.

Complete step by step answer:
1.Fe
Iron (Fe) is a metal with atomic number 26. It belongs to group 8 and period number 4. It is a transition element (belongs to the d block). It is extracted from the earth’s crust. The core of the earth mainly consists of iron with nickel and sulphur. The iron ores are hematite, magnetite, and taconite.

2.Ru
Rubidium belongs to group 1 and period number 5 with an electronic configuration of 37.
Its position is in the s block in the periodic table. Rubidium is the 16th most abundant element in the earth's crust. But still, it is relatively rare, it is found in potassium minerals and with caesium as well.

3.Te
Tellurium has an atomic number 52 and is a p block element. It’s from group 16 and period 5. Tellurium is found as a free element but is also found in the ores sylvanite, calaverite, and krennerite.
So, as all the elements mentioned above are obtained from the ores from earth's crust and they are not man-made

So, the correct answer is Option D .

Note: Manmade elements are a result of the manipulation of fundamental particles in a nuclear accelerator. They are also referred to as synthetic or artificial elements.There are almost 24 synthetic elements such as Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, etc.They are with atomic numbers 95 – 118