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Asked by Affaan Last Modified
Answer 
Amitabh Mishra
A -- Carbon , because it has least size among these so maximum energy required to remove an electron
B-- .Aluminium , because it has maximum size among these so it has highest electropositivity (least energy requires to remove an electron)
So Aluminium has highest metallic nature among these
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A)..The highest first I.E. is seen in carbon as it is non-metal which generally have higher I.E. as they are electronegative in nature and also it is tetra covalent due to which the release of any electron is very difficult from its excited state...
B)..most metallic character is found in Aluminium....
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A)The highest first ionisation enthalpy is seen in carbon as it is non metal compared to si because down the group nonmetallic character decreases and similarly from right to left nonmetalic character decreases hence carbon has highest IE than Si, B and Al. And also carbon is electronegative in nature & also it is tetra covalent due to which the release of any electron is very difficult from its excited state.
B) Among B, si, c and Al Aluminium has more metallic character because from right to left metallic character increases. And also it has highest atomic radius.
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