3. in a sample of 500 nitrogen atoms, two atoms are found to be nitrogen-15, with a mass of
15.000109 each, and 498 atoms are found to be nitrogen-14, with a mass of 14.003074 each.
calculate the atomic mass of nitrogen. (hint: calculate the relative abundances first.)

With the largest atoms and the smallest number of valence electrons and with the smallest atoms and the greatest number of valence electrons are the most reactive. a. nonmetals; metals b. nonmetals; transition elements c. transition elements; metals d. metals; nonmetals