When a chemical reaction creates a thin film outline of an anmial or plant what type of preservation has occured?

the answer is na (sodium)

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

answerspecific gravity;