Only two isotopes of boron (B) occur in nature; theiratomic masses and abundances are given in the followingtable. Complete the table by computing the relative atomicmass of 11B to four significant figures, taking the tabulatedrelative atomic mass of natural boron as 10.811.Isotope              % Abundance              Atomic Mass10B                            19.61                      10.01311B                               80.39                        ?

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