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.
Most organic iodine compounds are in the -1 oxidation state. Most iodides are colorless or reddish-yellow and are weak reducing agents. +1 and +3 compounds are quite rare. They are both oxidizing agents. +1 compounds are found as iodine monochloride and hypoiodites. +3 compounds are found as iodine trichloride or iodine trifluoride. +5 compounds are found as iodates and iodic acid. Iodine pentafluoride and iodine pentoxide are iodine compounds in the +5 state.