Which correctly lists three characteristics that are used to describe alr? altitude, density, radiation
density, radiation, mass
mass, pressure, density
O pressure, altitude, radiation.

pressure altitude and radiation

Explanation:

beacuse in atmosphere there is aire pressure atmospheric pressure and ofcourse radiation is there as well as altitude at heights

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