What is the purpose of the zigzag line on the periodic table?

Identify a strong intermolecular force of attraction between an alcohol

What metric units would you use to measure the thickness of a key

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o