Composition of the nuclei of two atomic species X and Y are
given as under
X Y
Protons = 6 6
Neutrons = 6 8
Give the mass numbers of X and Y. What is the relation between
the two species?
The average atomic mass of a sample of an element X is 16.2 u.
What are the percentages of isotopes 16
8 X and 18
8 X in the
sample?
12. If Z = 3, what would be the valency of the element? Also, name
the element.
If bromine atom is available in the form of, say, two isotopes
79
35 Br (49.7%) and 81
35 Br (50.3%), calculate the average atomic
mass of bromine atom.
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