If someone tells you they have a sample of niobium-90, can you tell how many neutrons are in the nucleus?
a. Yes, there are 41 neutrons.
b. Yes, there are 90 neutrons.
c. Yes, there are 49 neutrons.
d. No, more information must be given.
e. No, there is no such thing as "niobium.".
C
You do need to look up the atomic number of niobium in the periodic table.
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A light-year is
A) about 10 trillion kilometers. B) the time it takes light to reach the nearest star. C) the time it takes light to travel around the Sun. D) about 300,000 kilometers per second.
The force that binds atoms together to form molecules is
A) gravitational. B) nuclear. C) electrical. D) centripetal. E) none of the above
On what basis are we sure that no quasar is lurking among the thousands of member galaxies in the Virgo Cluster, 18 Mpc distant?
What will be an ideal response?
How is the circumference, Cn, of the nth orbit in hydrogen and the de Broglie wavelength, 
of the n th orbit related?
a. 
b. 
c. 
d. 
e. 