A) two places
B) three places
C) five places
D) one place
Correct Answer: A
Solution :
Key Idea: \[\alpha \]-particle is doubly ionized helium atom. When an \[\alpha \]-particle is emitted from the nucleus of a radioactive atom, the atomic number is reduced by 2 and mass number is reduced by 4. \[=\frac{0.1T}{T}\times 100=10%\] (\[T=2\pi \sqrt{\frac{l}{g}}\]-particle) Elements are placed in the periodic table according to their atomic number. The emission of an a-particle from the atom of an element reduces its atomic number by 2, so the element is converted into a new element which occurs 2 steps earlier in the periodic table.
You need to login to perform this action.
You will be redirected in
3 sec
