Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms

Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms

Silicon atoms is bonded to two oxygen atoms

there are double bonds between silicon and oxygen atoms

AlCl₃

Al₂Cl₆

Al₂O₃

Al(OH)Cl₂

HI > HBr > HCl > HF

HF > HCl > HBr > HI

HCl < HF > HBr < HI

HI > HCl < HF < HBr

zero

two

one

three