The composition of two atomic particles is given below: Particles X Y Protons 8 9 Neutrons 8 10 Electrons 8 9 a) What is the mass number of X? b) What is the mass number of Y? c) Which elements do they represent?

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Solution

Mass Number = no of protons + no of neutrons
a) Mass Number of X = 8+8=16
b) Mass Number of Y = 9+10=19
c) X is oxygen
Y is an isotope of Fluorine, F-19

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