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1. Question
Which of the following compounds would have Lewis dot diagrams constructed with the same number of valence electrons as NH4+?
CorrectThe family number can help predict the number of valence electrons of an element. The ammonium ion, NH4+ has 5 valence electrons from the nitrogen, 4 valence electrons from the hydrogens (1 from each hydrogen). The “+” indicates that one valence electron was lost. Therefore, the total number of valence electrons of NH4+ are: 5 + 4 – 1 = 8 valence electrons. The only compound that also has 8 valence electrons when bonding is H2O, with 2 valence electrons from the hydrogens and 6 valence electrons from oxygen.
IncorrectThe family number can help predict the number of valence electrons of an element. The ammonium ion, NH4+ has 5 valence electrons from the nitrogen, 4 valence electrons from the hydrogens (1 from each hydrogen). The “+” indicates that one valence electron was lost. Therefore, the total number of valence electrons of NH4+ are: 5 + 4 – 1 = 8 valence electrons. The only compound that also has 8 valence electrons when bonding is H2O, with 2 valence electrons from the hydrogens and 6 valence electrons from oxygen.