11. There are several types of compounds are formed, such as NaCl and CaF2 KI HF formed compounds containing elements of the same type element.There are so many types, such as multiple lekoksidechan NaClO NaClO2 NaClO3 NaClO4 Cl2O ClO3 ClO2 and Cl2O7 etc.12. that among the VIIA in a slightly different color, and yet because it is not a polar molecules dissolve well in organic solvent such as CCl4 Cl2 CCl4 in the colorless >> >> Br2 CCl4 in Orange >> I2 in CCl4 purple.13. the elements of the address. Can react with the substance of the elements of the lai hang lower now, but that is now on the bottom will not react with the substance of the elements of the lai hang on now, it concluded that "the ability to perform the reaction of that group VIIA will decrease from top to bottom" in the table.
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