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this is because physical properties of any atom or element depend upon their mass no.
isotopes are those compounds, which have their mass no. different and same atomic number. thus,....
conc. suplhuric acid has a very strong affinity for water. thus it absorbs the water even chemically combined water from substances, which makes it a very strong dehydrating agent.
alcl3 is a compound formed due to the valency of al3+ electrovalent bond. between al3+ and cl1- while pcl3 is a compound formed due to the 3 single covalent bonds between phosphorus and chlorine.
hydrogen though being a non metal, shows metallic properties. and has only one electron in its valence shell. thus.....
table salt has mgcl2 and cacl2 impurities which are deliquescent in nature, which absorbs the atmospheric moisture.