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OCR: How elements bond together to forn compounds depends on their electron shell structures. If we look at the structure of sodium and chlorine we find that both atoms want to move 1 electron, Sodium wants to lose an electron and chlorine wants to gain one. When the two elements are combined they form sodium choride: salt. This seems too good to be true, but happens all the time where one element wants to lose electrons and another is only too happy to take them. The formation of salt therefore occurs when an electron transfers from sodium to chlorine; number of electrons + in outer shell Na- + -C1: Na :C1 : electron structure -+ 2,8,1 2,8,7 2,8 2,8,8 Remember that electrons are negatively charged so the result of the above is that the sodium atom ends being positively charged and the chlorine ...