)describe the arrangement within energy levels of the seven electrons of an atom of nitrogen.

The arrangement within energy levels of the seven electrons of an atom of nitrogen is  2.5 (that is the first sub shell= 2 while the second sub shell=5)

explanation

In every atom the first energy level can accommodate a maximum of two (2) electrons. The next energy level can accommodate a maximum of 8 electrons. Therefore the seven electron for  nitrogen,  2 electron are put on first sub shell  while other other 5 are putted in the second sub shell.