(B) Isotones are atoms of different elements that have the same number of neutrons in their nuclei.To find the number of neutrons,we use the formula:

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${ }_{6}^{12}C ; { }_{5}^{11}B$

(B) Isotones are atoms of different elements that have the same number of neutrons in their nuclei.To find the number of neutrons,we use the formula: $n = A - Z$,where $A$ is the mass number and $Z$ is the atomic number.For ${ }_{6}^{12}C$: $n = 12 - 6 = 6$.For ${ }_{5}^{11}B$: $n = 11 - 5 = 6$.Since both have $6$ neutrons,they are isotones.