1. Modelaţi structura atomilor, repartizaţi electronii pe starturi, indicaţi grupa, perioada, procesul de ionizare şi caracterul chimic pentru elementele:
27
13 Al 31
15P 16
8O
39
19K
8O
39
19K

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state.a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car