Carbon-12 is the most
common isotope of carbon.
it has 6 protons, 6 neutrons,
and 6 electrons. of its 6
electrons, 4 are valence
electrons. how many
covalent bonds can a carbon
atom form?

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.