An example substance has a mass of 3.4 g in a volume of 8 mm what is the density of the substance

particle   p is an electron and particle q is a neutron

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

answer///carbon;