What are the exceptional metals & non metals from the first 20 elements?

H

human

New member
Maybe its Hydrogen Due to its valency, and potassium and calcium due to their electronic configuration.
But I've no idea If its correct or not!
Please help!
If you find any link on the Net for the following please don't mind sharing, I tried to find myself but couldn't succeed. Your Help will be appreciated.
Good Green Day!
 
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