1) What makes a dog a great animal for detecting scents? How do they compare to humans in their ability to detect scents?​

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 and three oxygen atoms;