How many electrons are in an atom of elemental sodium? a) equal to the number of neutrons b) equal to the number of protons c) equal to the number of protons and neutrons

What is the chemical formula of the following compound

Imagine that you have produced several versions of lactase, each of which differs from normal lactase by a single amino acid. describe a test that could indirectly determine which of the versions significantly alters the three-dimensional shape of the lactase protein.

How many absorptions would you expect to observe in the 13c nmr spectra of the following molecules? a) 3-chloropentane b) cis-4-methyl-2-pentene