3.9 because when you use scientific notation you move your . Space
Physical change , the states are changing from liquid to gas
The believe that the best answer among the choices provided by the question is O with a pair of electrons above and below, a double-bond to the N with a pair of electrons above, a double-bond to the O with two pairs of electrons around it.
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I was unable to come up with an answer but I still wanted to help so heres a site that'll give you your answer. http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch1/index.php
The metals are found on the bottom left of the table, while the nonmetals are found at the top right. These elements are separated by a 'band' of semimetals