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  • are the elements of the 3rd period of the Modern Periodic Table having group number 1, 2 and 13 respectively. Which one of the

Na, Mg \; and \; Al are the elements of the 3rd period of the Modern Periodic Table having group number 1, 2 and 13 respectively. Which one of these elements has the (a) highest valency, (b) largest atomic radius, and (c) maximum chemical reactivity ? Justify your answer stating the reason for each.

 

 

 

 
 
 
 
 

Answers (1)

(a) Highest Valency :- Al has highest valnecy

Reasons :

Atomic no. of elements & electronic configuration

Al=13 (2,8,3)

Mg=12 (2,8,2)

Na=11 (2,8,1)

So the highest Valency of Al (3+)

(b) Largest atomic radius :- Na

Reason: because atomic size decreases across a period

(c) Maximum chemical reaction : Na

Since reactivity decreases across a period.

Posted by

Priyanka Kumari

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