Answer :
Answer;
(2) one less proton
Explanation;
-Sulfur-32 is an isotope of sulfur that contains 16 protons, 16 electrons and 16 neutrons. Since the mass number is the sum of protons and neutrons then its mass number is 32.
-On the other hand, phosphorus-31 which is an isotope of phosphorus, contains 16 neutrons, 15 protons and 15 electrons, thus its mass number is 31.
-Therefore; Phosphorus has 1 less proton and electron than sulfur in this case because the number of protons are equal to the number of electrons in the element.
