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As you're drawing the Lewis structure, it should become clear if you have too few electrons to give octets to all the atoms. In instances such as this, it is appropriate to make double bonds. Double bonds (and triple) should only be included out of necessity.
When drawing a Lewis structure, you have to count the valence electrons of every element and multiply that number by the amount of molecules of that element if that is needed. After you know how many total electrons there are, you can start drawing the structure with, generally, the least electronegative element in the middle. You know you need to use a double bond when the octet rule is not satisfied. The octet rule depicts the tendency of atoms to want a valence shell of eight electrons.
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