If a baseball were the size of Earth, about how large would its atoms be?

If the density of a certain alcohol is $0.785 \frac{\text{g}}{\text{mL}}$, what volume of the alcohol would have a mass of $75.0 \ \text{g}$?

Is it possible to see an atom using visible light?

Which is the oldest element?

What is the relationship between the maximum number of electrons each shell can hold and the number of ele- ments in each period of the periodic table?

Which electrons are most responsible for the properties of an atom?

Why do your ears “pop” when you ascend to higher altitudes?

You could swallow a capsule of germanium, Ge (atomic number $32$), without significant ill effects. If a proton were added to each germanium nucleus, however, you would not want to swallow the capsule because the germanium would (a) become arsenic. (b) become radioactive. $(c)$ expand and likely lodge in your throat. (d) have a change in flavor.

Distinguish between an atom and an element.

Does the periodic table explain the noble gas shell model, or does the noble gas shell model explain the periodic table?

An electron confined to an atom has waves that are what?

What is a practical application of the wave nature of an electron?

Who first proposed that electrons exhibit the properties of a wave?

Did Bohr think of his planetary model as an accurate representation of what an atom looks like?