The atomic number of nitrogen is 7. The number of electrons a neutral nitrogen atom has is _, and its atomic mass is approximately _ amu. 1. 7 2. 14 1. 14 2. 7 1. 8 2. 16 PLEASE HELP

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere