With completing steps (photo attachted)

Step 1 is correct.

Step 2.

There are 2 Iron (Fe) atoms in the formula so we will multiply 2 with the relative mass of Fe .

 

Relative mass of Iron atoms in the formula is 112 amu (atomic mass unit)

Step 3.

To find the percentage,

we will divide mass of iron to total mass and equal that to x divided to 100.



Total mass of iron is 70% of the total mass of the formula.

 

Alpha particles have positive charge, beta particles have negative charge, and answer 4 just doesn’t make sense. thus, you are left with only one possible answer.

Because electrons have negligible mass, to account for the mass of the isotope, there must be 16 neutrons, 16 neutrally charged, massive, fundamental particles present in the sulfur nucleus. and thus finally, if we have the 32s2− ion, there are 18 electrons, 16 protons, and 16 neutrons.