How can you know that's a metal or nonmetal at any trick it's any tric

1.	How can you know that's a metal or nonmetal at any trick it's any trick
Answer» ermost orbit is called valence shell and the electron present in valence shell is called valence electrons. The OUTERMOST shell is 3RD shell so it is called valence shell of sodium and it CONTAINS 1 elctron so ,It's valence electron is 1. The elements comes under Group no 1,2and 3 are metals so sodium is metal .

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