Question

Which element of the following has the highest ionisation potential?
Na, Cl, Si and Ar.

Answer 1

Correct Answer :- Ar (Argon)  ⇒ Among Na, Cl,  Si , Ar . The element which is having Highest Ionization potential is Ar ( Argon ) 

Reason/Explanation :- Na ,Cl , Si , Ar , These all elements belong to the third period .
In the third period , Argon(Ar) has the highest ionization potential & The Element having Lowest Ionization potential is Sodium

 Because :-

(i) Ionization energy get increases as we move left to Right in the period. Argon is in right.

(ii) Argon is highly stable as it is noble gas . Also having 8 electron in the outermost cell .


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