What is common in the (i) isobars (ii) isotones ?

What is isotone?

What is common in the following figures (i) and (ii) (Fig. 2.36.) ? Is Fig. 2.36 (i) that of triangle ? If not why ?

What are isotones ?

What is same in isotone ?

What are Isotones ?

Write a note on isotopes, isobars and isotones.

what are the isobars?