Rocks are sometimes used along coasts to prevent erosion. If a rock needs to weigh 2,361 kilograms in order not to be shifted by waves, how big (what volume in mº) does
it need to be? You are using a rock with a typical density of 834 kg/m3

that's what i got you can count the number of atoms

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.

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