46. Select the two types of isotopes occurring in nature.
half of the
number of
a. Normal and abnormal.
radioactive
atoms to
b. Natural and artificial.
disintegrate.
c. Alpha particles and beta particles.
d. Stable and radioactive.
d.
47.
Match each term in column A with its definition in column B.
A
B
_____ (1) Mass number.
a. One-twelfth the mass of a C12 atom.
_____ (2) Atomic mass unit.
b. The sum of electrical charges within
the atom.
_____ (3) Relative atomic
weight
c. The absolute mass, in atomic mass
units, of the most abundant isotope
of an element
d. The sum of the protons and the
neutrons of the nucleus.
e. The average mass, in atomic mass
units, of an atom's natural isotopic i-
mixture.
IT0341
1-34
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