What is the main characteristic of the last elements in the periods of a periodic table ? What is the general name of such elements ?

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Solution

They extremely low chemical reactivity as compared to other elements.

These elements of each period have their outermost shell completely filled with, i.e. 2 or 8 electrons.

The general name is inert gases or noble gases.

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Similar questions

(a) What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?

(b) What is the number of elements in (a) 1st period, and (b) 3rd period, of the modern periodic table?

Occurence of characteristic properties of element at regular intervals in a periodic table is considered as periodicity in properties of elements.

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