Which statement describes the atoms in the molecule with the chemical formula na2co3? a. two atoms of sodium, two atoms of carbon, one atom of oxygen b. two atoms of sodium, one atom of carbon, three atoms of oxygen c. one atom of hydrogen, one atom of chlorine, three atoms of oxygen d. two atoms of nitrogen, four atoms of carbon, three atoms of oxygen

Two students are discussing electricity that has a frequency of 60 hz. student a says that this type of electricity is referred to as ac. student b says that in this type of electricity, the electrons flow in only one direction. which of the following statements is correct? a. only student a is correct b. only student b is correct c. both of the two students are correct d. neither of the two students is correct