Answer:
Isotopes: These are atoms of same element with same atomic number (Z) and different mass number (A). Isobars: These are atoms of different elements with same mass number (A). Isotones: These are atoms of different elements with same number of neutrons (n). Let us first find the Z, A and n of the given species.
From the above chart, it is clear that (i) A, C and L, S are pairs of isotopes. (ii) L and B are isobars (iii) D, E and C, T are pairs of isotones. Nuclide Z A N \[_{1}{{A}^{1}}\] 1 1 0 \[_{3}{{D}^{7}}\] 3 7 4 \[_{1}{{C}^{3}}\] 1 3 2 \[_{6}{{L}^{12}}\] 6 12 6 \[_{5}{{B}^{12}}\] 5 12 7 \[_{4}{{E}^{8}}\] 4 8 4 \[_{6}{{S}^{14}}\] 6 14 8 \[_{2}{{T}^{4}}\] 2 4 2
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