The Duet Rule H,He,Li,and Be only need 2 valence electrons H20 > :0:H 0-H H H .They are trying to "be like He",the nearest inert gas So,we predict NH3 and PHa to be stable compounds H-N-H H-P-H H H V-10The Duet Rule H, He, Li, and Be only need 2 valence electrons H2O O H H O H H So, we predict NH3 and PH3 to be stable compounds N H H H P H H H •They are trying to “be like He”, the nearest inert gas V-10