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Why does NO3 have a charge of -1 (I know there's 3 oxygens which gives a charge of -6 but Nitrogen should only have a charge of +1, giving an overall charge of -5) How do you work out the charges of transition metals when they've bonded with other, non transition elements, and therefore how do...

When it comes to taking your driving test and they ask you to read the number plate from 20 metres, do they ask you with both eyes open or do they do like an optician does with those eye sight assessment tests (1 eye and then the other)? I'm asking because I was doing some reading around...

for a 17 year old? I was thinking a used Volkswagon Golf (would that be a good car to save for?) The car must be for England, UK This is for when I learn to drive in 2010 :)

Will be learning to drive next year and hopefully getting a job as well and I want to know where can I find some decent used cars so I can get saving and hopefully get one one day

What are the requirements? How old must you be? What companies in the UK need couriers? Anything I need to know?

I live near London (Slough to be exact) in the UK and I want to know how do you become a bike courier? How old do you have to be (I'm 16 currently, but will be 17 by the end of the year)?

...games a quick charge and...? some DLC? If I traded that for a PS3? Is it a good idea to trade gaming hardware because I like my XBOX but I'm not sure why I keep looking at a PS3?? O_o