Question

how to find silicon is metal or not by using its valence electron

Answer 1

Silicon is a chemical element with symbol Si and atomic number 14. A hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent Silicon shares the bonding versatility of carbon, with its four valence electrons, but is otherwise a relatively inert element. 

Answer 2

Silicon generally show metallic property.
Si(14)=> 2,8,4
Silicon share valence electrons with other atoms.
Eg=> Silicon dioxide (SiO2)

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