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.
The only stable isotope of iodine, 127I, has 74 neutrons. There are 36 other known isotopes of iodine, and an account of all these isotopes of iodine can be seen by using the link to the Wikipedia article on iodine's isotopes. The only stable isotope of iodine, 127I, has 74 neutrons.