Answer:
Argon - 38
protons - 18
electrons - 18
neutrons - 20
Argon 39
protons - 18
electrons - 18
nuetrons - 22
Mg - 24
protons - 12
elecrtons - 12
nuetrons - 12
Mg - 25
protons - 12
electrons - 13
nuetrons - 12
Hope this helps good luck and stay safe always <3