A 30. mL sample of distilled water at 10ºC is added to a 50. mL sample of the same water at 50ºC in a coffee-cup calorimeter. Th
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Answer: noble gasses
Explanation: zoom on on the red section and look at the key for what red means.
Nitrogen has 5 valence electrons (ve-), so a diatomic nitrogen molecule will have twice as many, 10 valence electrons. Then, just draw electrons in pairs of 2 until you both get ride of all of them (reach 0) and you fill every atom (eight electrons each). It can be drawn either way, the important thing is that there are 3 electron pairs shared between the two atoms.
