Can someone please help I will mark u brainliest (PLEASE IT¨S URGENT)

Floor 19 is an isotope of fluorine it has different number a. electrons b. protons c. neutrons d. electron shells

Why does 4.03/0.0000035 = 1.2 x 106, instead of a different number of significant figures?

If 4.88 grams of zn react with 5.03 grams of s8 to produce 6.02 grams of zns, what are the theoretical yield and percent yield of this reaction? be sure to show the work that you did to solve this problem. unbalanced equation: zn + s8 yields zns