the atomic number of an atom identifies the number of protons in its nucleus.

if the overall charge on the atom is neutral, what must the atomic number also identify?

a.
the most common isotope's mass

b.
the average mass of all isotopes of the atom

c.
the number of electrons in the atom

d.
the number of neutrons in the atom

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)