Rank the following from the highest electron affinity to the lowest electron affinity: Helium, Cesium, Chlorine, Lithium and Radon?

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.

7is b8 is d9 is c10 is a11 is d