Question

Is sulphur form double bond?

Answer 1

The larger atoms of the third row and heavier are not very good at making multiple bonds. Oxygen will form O2, with a double bond between the O atoms. Sulfur is not quite as "happy" doing this (i.e. the double bond between S atoms is not quite as favorable). So, elemental sulfur prefers to assemble itself into S8 rings with only single bonds between the S atoms