When you have both of these ( The periodic table of elements and the formula of your compound) you are able to calculate the R.M.M ( Relative atomic mass) of that compound. For example the formula of a NaCl ( Table salt ) has the elemnt Na and Cl. We look at the atomic mass of both of these compounds Na - 23 Cl - 35.5 R.M.M = 23 +35.5 = 58.5 Hope this helps :).
I think the correct answer among the choices is option B. The statement which does not describe the relationship between the nucleus and the electron cloud of an atom will be that the <span> masses of the nucleus and electron cloud are balanced.</span>
