Match the events related to the formation of the universe with the stages in which they occurred

Answer : The chronological order events related to the formation of the universe with the stages in which they occurred are given below;

For better understanding please refer the attachment.

2b2t

explanation:

2b2t

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.