The #pragma directive cannot be used in a macro definition because the compiler interprets the number sign character ('#') in the directive to be the stringizing operator (#). The following code example demonstrates how the __pragma keyword can be used in a macro.
The mass number for iodine is 131, which is the sum of the protons  and neutrons. Iodine has 53 protons and 53 electrons, if neutral.  To find how many neutrons iodine has s â¦ ubtract 53, the number of  protons from the mass number of 131. This shows that iodine has 78  neutrons.
Best Answer: Iodine is one of those few elements that has only one stable isotope. There are over 40 isotopes of I, but only one stable isotope, and it has a mass number of 127. The remaining isotopes of iodine can have a wide range of mass numbers. http://www.dayah.com/periodic/ indicates that there are mass numbers for iodine from 108 to 144.