What is the mass of 5.33×1021 platinum atoms

To find mass of a bunch of atoms, we first have to convert to moles (using Avogadro's number), then the atomic mass (from the periodic table):

5.33 x10^21 atoms Pt x (1 mole/6.022x10^23 atoms) x (195.08 grams Pt/1 mole)
= 1.73 grams of Pt

Notice the answer has three digits - three significant figures since the 5.33 has three sig figs - the fewest of all the values in the problem.

Ithink that the use of creativity in the sciences entails that one produce something out of nothing or from another thing. with this, i think that the he wrote down his results as four parts of the atomic theory is the manifestation of the  creativity of john dalton.

The closer the atoms are to becoming ionic the more highly dense the negatively charged side gets.