For each of the elements below,there are only two naturally occurring isotopes.Using the atomic masses on the periodic table,identify the pair in which the heavier isotope is the more abundant one.
A) "63Cu and 65Cu"
B) "85Rb and 87Rb"
C) "10B and 11B"
D) "79Br and 81Br"
E) "14N and 15N"
Correct Answer:
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