Nitrogen (n) has an atomic number of 7 and an atomic mass of 14. which of the following correctly shows the electron arrangement for nitrogen?

7 protons means that N atom has 7 electrons

1st level can have only 2 e⁻, and we have left over of 7-2=5 e⁻, that will go on the second level.

B. 2,5

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8