) Boron occurs in nature in the form of two isotopes having atomic mass 10u and 11u. Calculate the percentage abundances of two isotopes in a sample having average atomic mass 10.8u.
b)How did Rutherford come to conclusion that most of the space in an atom is empty? What is the limitation of Rutherford’s model of the atom?
c)Define the relationship between two elements P and Q whose atomic numbers are 18 and 20 respectively but their mass numbers are the same i.e. 40.
(5 Points)
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