For each of the following elements , there are only two naturally occurring isotopes . In which of the following pairs is the lighter isotope the
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4.

For each of the following elements, there are only two naturally occurring isotopes. In which of the following pairs is the lighter isotope the more abundant? (Hint: Look at the periodic table.)

(a) 6Li, 7Li (b) 79Br, 81Br (c) 10B, 11B (d) 191Ir, 193Ir
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Subject: Chemistry, Science

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