Neils bohr measured the eneray required to move the electron
hydrogen atom out of its ground state and the energy emitted when the
electron returned to its ground state. what did he learn about the structure of
the atom from this information?
a. the existence of the electron.
the law of multiple proportions.
c. the existance of the nucleus
d. that the electrons reside in the electron cloud in shells (or energy
levels) with fixed amounts of energy.

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5

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.)

How many neutrons does an element have if its atomic number is 50 and its mass number is 166