Out of SiO_2 (s) , Si(s), NaCl(s) and Br_2(l) which is the best electrical conductor ?

Out of SiO_2 (s) , Si(s), NaCl(s) and Br_2(l) which is the best electr

1.	Out of SiO_2 (s) , Si(s), NaCl(s) and Br_2(l) which is the best electrical conductor ?
Answer» Solution :SI(s) because only this is a semiconductor, while OTHERS `SiO_2(s)`, NACL(s) and `Br_2`(L) are insulators .