When scientists look at these examples, what do they know about the atoms?
carbon–12 carbon–14
a.
the number of neutrons in each atom is not the same.
b.
the atoms have different properties.
c.
one atom has more protons than the other.
d.
only one of the examples is an isotope.

The average atmospheric pressure on earth is approximated as a function of altitude by the relation patm = 101.325 (1 − 0.02256z)5.256, where patm is the atmospheric pressure in kpa, and z is the altitude in km with z = 0 at sea level. determine the approximate atmospheric pressures at atlanta (z = 306 m), denver (z = 1610 m), mexico city (z = 2309 m), and the top of mount everest (z = 8848 m).