You have two pieces of jewelry. One of them is supposed to be pure silver. The first piece has a mass of 20.0 g and the other
piece has a mass of 44.0 g. Both pieces displace 4.0 mL of
water. Silver has a density of 10.5 g/cm Which piece is
actually silver?

its going to be mutualism cuz they both benefit from the relationship.

~batmans wife dun dun

it's c. elements are placed in rows based on how may valencies electrons have.

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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.