Agood scientific blank can be repeated by someone else, and the same results will be found? due monday need

b) mutualism

hope this : )

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