40. (Continued)
Match each term in column A with its definition in column B.
A
B
a. One-twelfth the mass of a C12 atom.
_____ (1) Mass number.
_____ (2) Atomic mass unit.
b. The sum of the protons and the
neutrons of the nucleus.
_____ (3) Relative atomic
weight.
c. The average mass, in atomic mass
units, of an atom's natural isotopic
mixture.
d. The absolute mass, in atomic mass
units, of the most abundant isotope
of an element.
e. The sum of electrical charges within
the atom.
(1) b.
41. Select the definition of an isotope.
(2) a.
a. Different forms of an element, each having a different atomic mass.
(3) c.
b. Ionized forms of an element, each having a constant mass.
c. Atoms that have suffered a loss in atomic mass as a result of electron
removal.
d. Atoms that have increased in atomic mass as a result of electron
attraction.
IT0341
1-30
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