What is the percentage of a 200 gram sample of Nitrogen-16 that decays to 12.5 grams in 21.6 seconds?

25%
100%
6.25%
12.5%

The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a.an ionic bond is formed between the oxygen and carbon atoms. b.four valence electrons are shared. c.two valence electrons are shared. d.valence electrons are shared between oxygen atoms.