What is true all atoms?

Its is D.)

Explanation:

All atoms have at least one proton and one electron. That would describe a normal hydrogen atom. Atoms make up the elements so all elements are made of atoms. Most atoms will bond with at least one other atom but not all.

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.