Given the balanced equation representing a reaction:
nh3(g) + h2o(l) ==> nh4+(aq) + oh-(aq)
according to one acid-base theory, the nh3(g) molecules act as
(1) an acid because they accept h+ ions
(2) an acid because they donate h+ ions
(3) a base because they accept h+ ions
(4) a base because they donate h+ ions

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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