Composition of the nuclei of two atomic species X and Y are given as under:X YProtons 6 6Neutrons 6 8Give the mass numbers of X and Y. What is the relation between the two species?
Question
Composition of the nuclei of two atomic species X and Y are given as under:X YProtons 6 6Neutrons 6 8Give the mass numbers of X and Y. What is the relation between the two species?
Solution
The mass number of an atom is calculated by adding the number of protons and neutrons in the nucleus.
For atomic species X: Number of protons = 6 Number of neutrons = 6 So, the mass number of X = Number of protons + Number of neutrons = 6 + 6 = 12
For atomic species Y: Number of protons = 6 Number of neutrons = 8 So, the mass number of Y = Number of protons + Number of neutrons = 6 + 8 = 14
The relation between the two species is that they are isotopes of each other. Isotopes are atoms of the same element (same number of protons) but with different number of neutrons, hence different mass numbers.
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