The composition of two atomic particles is given below :
X
Y
Protons :
8
8
Neutrons :
8
9
Electrons :
8
8
(i) What is the mass number of X ?
(ii) What is the mass number of Y ?
(iii) What is the relation between X and Y ?
(iv) Which element/elements do they represent ?
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Solution
(i) Mass number of X = 8+8 = 16
(ii) Mass number of Y = 8+9 = 17
(iii) X and Y are isotopes, as they have the same number of protons but different number of neutrons.
(iv) X and Y represent the isotopes of oxygen.