Inactive, having few or no active chemical properties.

Noble gases or inert gases

Explanation:

Noble gases have general electronic configuration of .

The chemical property of a substance is determined by the loss or gain of electrons.

As the sub-shells of noble gases is fully filled and their octet is complete. Hence, it does not lose or gain any electron. Thus have zero electron affinity. Thus they are also called as inert gases and have few or no chemical properties.

no , per capita income is not a true measure of the development because: -it only tells us about average income not how income is distributed among the people.it only give us an idea of the economic aspect.it is only at the qualitative basis.moreover, income is not only the way of development other factors are also as much as important as income.