How to classify metals or non metals by given atomic number??

1.	How to classify metals or non metals by given atomic number??
Answer» See first to the electronic configuration and then see the valence electrons in last shell now is the valence electron is is less than 4 then it is metal if more than 4 it is non metal and if 4 it is metalloid as an element which gains electrons is non metal and which gives or loss electron is metal .

Discussion