The triple point of iodine is at 0.12atm and 115 C. Thus liquid I2:. A) Is more dense than solid I2
B) Cant exist above 115 C
C) Is liquid at room temperature
D) Cant have a vapor pressure less than 91 torr

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.