Which of the following are isotones with each other?
3216S
Isotones are atoms of different elements containing the same number of neutrons.
Now, Let's calculate the number of neutrons.
Number of neutrons = Mass number - Number of protons
⇒ 3015Si → 30 - 14 = 16
3115P → 31 - 15 = 16
3216Si → 32 - 16 = 16
3517Si → 35 - 17 = 18
Therefore,
3015Si , 3115P and 3216S are isotones.