In the periodic table, valence electrons are indicated by 

Nucleons are sub-atomic particles which consist of

A few drops of sodium hydroxide is added to an aqueous solution, a green precipitate is formed. The ion that may be present in the solution is 

When C\(_2\)H\(_4\) molecule is polymerized, the polymer formed is 

When a hypothesis is proven within the limit of available evidence, it becomes a