Five valence electrons for one nitrogen and 10 valence electrons for two nitrogens
The closeness of a measurement to its true value is a measure of its accuracy. This term is the degree of which a certain measurement conforms to the correct value or the standard value. It is not the same with the term precision. Precision, on the other hand, is a measure used to characterize the closeness of the data measured.
Kelvin is the standard unit for temperature, just how like grams is for weight. We need to use it because it’s based on the idea of absolute zero, or 0K, which is a point where time itself freeezes