Which of the following comparisons correctly describes subatomic particles?
O An electron has a negative charge and a mass larger than the mass of a
proton.
O A neutron has a negative charge and a mass smaller than the mass of a
proton.
O. A neutron has a neutral charge and a mass larger than the mass of an
electron
O A proton has a positive change and a mass smaller than the mass of an
electron.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

answer; capital earns interest; entrepreneurship receives a profit or incurs a loss;

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.