13. Which is the best representation of the three-dimensional skeletal structure (molecular geometry) of the guanidinium ion, C(NH$_2$)$_3$$^+$? A) This ion cannot exist because it would violate the octet rule. B) H H N H C N N HH C) H H N H C N N HH D) H H N H C N N HH E) H H N H C N N H
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