Which of these is NOT a function of the skin?
to protect the body against outside invaders
to keep the body at a constant temperature
to release chemicals that control blood sugar
to allow the body to feel when something is touching it

pie chart because it is in percents ( % )

they are all solids.

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