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.
Explain with examples (i) Atomic number, (ii) Mass number,
(iii) Isotopes and iv) Isobars. Give any two uses of isotopes.
What do you mean by fixed cost ? How is the fixed cost curve ?
Summarise the rules for writing of distribution of electrons in
various shells for the first eighteen elements.
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