Is Ammonium ion a molecular ion?

The ammonnium ion NH4+ is a charged species, molecular ion, due to the fact the central atom nitrogen has insufficient non bonding electron pairs. For nitogen to be a neutral species is must contain one and only one non bonding pair. For example NH3 has three attached hydrogens and one non bonded electron pair. In contrast NH2- has to hydrogens attached and two non bonded electron pairs. The easy way way to remember the trend using the Periodic Table is CNOF 0123, where the letters stand for elements carbon to fluorine and the number trend that follows is the number of non bonded pairs required for a neutral species.