 Custom Search Lewis Dot of the Ammonium Ion NH4+ Since all the atoms are in either period 1 or 2, this molecule will adhere to the octet rule. The exception, of course, being the hydrogen's. They follow the duet rule (2 electrons). Ammonium has a tetrahedral shape with bond angles of 109.5o. It contains 3 polar covalent bonds and 1 coordinate covalent bond.
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