Question

The nuclei ${}_{13}A{l}^{27}$ and ${}_{14}S{i}^{28}$ are examples of:

• A. isotopes
• B. isobars
• C. isotones
• D. isomers

Answer 1

The correct option is C isotones

Number of neutrons present in ${}_{13}A{l}^{27}$ $=27-13=14$
Number of neutrons present in ${}_{14}S{i}^{28}$ $=28-14=14$
Since, elements which have equal number of neutrons are called as isotones, so ${}_{13}A{l}^{27}$ and ${}_{14}S{i}^{28}$ are isotones of each other.