type II binary compounds. i am so confused and dont have any idea the trend/ pattern in knowing how to tell if something is an IV or III or anything. my teacher explained it so fast that no one in the class understands i was wondering if anyone can explain type II binry compounds to me?

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A type II binary compound involves transition metals or metals underneath the metal/nonmetal staircase that starts under Boron, passes between Al and Si, under Si and between Ge,As and so forth.  The problem is you cannot tell what number of electrons will be lost by these metals.  It is usually 2 or more, though it could be 1 or more.  So the name of the compound uses a Roman numeral like (I) or (II) to tell you how many electrons have been given up by the metal.  For example: the compound FeO would be iron (II) oxide because the charge for the iron must be +2 to join with only one oxygen.  Fe2O3 would be iron (III) oxide so the positive and negative charges add to zero.  So if you have the name you can put the charge on the metal symbol and use the known charge of the nonmettal to figure out the correct subscripts.  If you have the formula, you must determine the charge of the nonmetal and its subscripts.  Then the metal's subscript times X must equal the nonmetal's subscript times its Known charge. Pb(NO3)2     Since you know nitrate has a -1 charge and there are two of them the negative charge is -2.  There is only one lead so its charge must be +2 so this is:  lead(II) nitrate.  You must include the correct Roman numeral for these teypes of compounds and it will always be for the metal, never for the nonmetal.  Hope this helps.