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  • (a) Define groups in the Modern Periodic Table. How do valency, atomic size and metallic character vary in a group ? (b) The atomic number of an element is . E

(a) Define groups in the Modern Periodic Table. How do valency, atomic size and metallic character vary in a group ?

(b) The atomic number of an element is 14. Examine if this element will have metallic properties or not. Give reason to justify your answer.

 

 

 

 
 
 
 
 

Answers (1)

(a) Group : Verical columns in the modern periodic table are known as 'Groups'. There are 18 groups.

\rightarrow Valency remain same in a group

\rightarrow Atomic size increases from to P to bottom in a group.

\rightarrow Metallic character also increases from top to bottom in a group.

(b) Atomic number =14

        Electric configuration =2\; \; 8\; \; 4

                                                 =K\; \; L\; \; M

It is semi-metal or metalloid

Reason - It exibits some properties of metals and some properties of non-metals.

Posted by

Sumit Saini

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