Hello candidate,

There are always exceptions in every single field and in different prospects, as these exceptions only make the world a more diversified and exciting place.

If we talk about a subject individually, there are a lot of individual exceptions in chemistry alone where each element differ from the other element in some prospect which makes its identity a unique one and which categorises its properties to differentiate from others.

So, each one is different from other and it's very common to have exceptions.

Feel Good!!