Boron occurs in two varieties, namely, \( { }^{10} \mathrm{~B} \) (...

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Boron occurs in two varieties, namely, \( { }^{10} \mathrm{~B} \) (atomic
P mass: \( 10.01 \mathrm{amu} \) ) and \( { }^{11} \mathrm{~B} \) (atomic mass: 11.01

W \( \mathrm{amu} \) ). The atomic mass of a naturally occurring element is reported as \( 10.81 \mathrm{amu} \). The percent of \( { }^{10} \mathrm{~B} \) in this naturally occurring boron
(A) 10
(B) 20
(C) 29
(D) 35
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