7. A sketch of Rutherford's equipment setup and observations is reproduced below
(Gold foil experiment - Tootsie Pop candy representation). Which observation let him
to conclude that the atom contained a nucleus?
gold foil
radiation
radioactive
source
ZnS screen
backward scattering
Forward scattering
a. backward scattering only
b. forward scattering only
c. both forward and backward scatterina

може ли да зареждате повече информация, моля

here are some of the ways in which chemical and nuclear reactions differ.

explanation:

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.