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.
(Original post by Yelleanor) I have the question Explain, in terms of covalent bonding, why iodine exists as simple molecules and carbon does not.. I found the exact same question on TSR but it was like the replies were in a different language, and im still none the wiser.Original post by charco) Iodine atoms have 7 electrons in the outer shell. They acheive a full apparent outer shell by sharing one pair of electrons. This allows two iodine atoms to bond together, each sharing the same pair of electrons and each having an apparent full outer shell. Thank you, you beautiful person.