Question

The elements which are radioactive and have been named after the name of planet are
A. `Hg` (Mercury) (Hergentium)
B. `Np` (Neptunium)
C. `Pu` (Plutonium)
D. `Ra`(Radium)

Answer 1

Correct Answer - B::C
a. `Hg` (derived from the word Hergentum) is not radioactive.
b. `Np` (Neptunium, `Z = 93`) is radioactive and named after the name of a planet.
c. `Pu` (Plutonium, `Z = 94`) is also radioactive and named after the name of a planet.
d. `Ra` (Radium, `Z = 88`) is also radioactive but not named after the name of any planet.