What effect would thick cloud cover have on the temperature of the earth's surface?

It would cool the average temperature. The thick cloud would block out all incoming sunlight, however, it would prevent any of the earth's heat from escaping into space. Still even with the prevention of heat from escaping, the lack of sunlight would cool down the earth more

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.