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(B) Isotonic species are those that have the same number of neutrons.For $_1^3T$ (Tritium),the number of neutrons $= A - Z = 3 - 1 = 2$.Now,checking t

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$_2^4He$

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(B) Isotonic species are those that have the same number of neutrons.For $_1^3T$ (Tritium),the number of neutrons $= A - Z = 3 - 1 = 2$.Now,checking the options:For $_1^2D$: $2 - 1 = 1$ neutron.For $_2^4He$: $4 - 2 = 2$ neutrons.For $_3^7Li$: $7 - 3 = 4$ neutrons.For $_5^{10}B$: $10 - 5 = 5$ neutrons.Therefore,$_2^4He$ is isotonic with $_1^3T$.

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