Scrieti configuratia electronica pt urmatoarele elemente: H, He, Be, C, N, O, Ne, Na, Al, Ar.
Precizati pt fiecare element cate straturi, cati orbitali si cati electroni are pe ultimul strat.

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