Để điều chế khí SO2 trong phòng thí nghiệm người ta cho Na2SO3 tác dụng với HCl. Hỏi phải dùng tối thiểu bao nhiêu gam dung dịch HCl 14.6% để điều chế được 2.24 lít khí SO2

particle   p is an electron and particle q is a neutron

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.

the objects have the same charge.