How would you draw the Lewis Dot Diagrams for elements 21-30?

Question

I am confused about this since elements 21-30 all have 1 or 2 valence electrons. They do not all have the same Lewis Dot diagrams right?

Answer 1

Right, they don't all have the same Lewis dot diagrams, but many of them do. There's no mystery to them at all. If you can draw the electron configuration, then you are set. So, I'll do a few examples (including exceptions), and hopefully you can do the others.

Sc (#21)[Ar]4s2 3d1 so the valence electron is the 4s2 electrons and dot structure is Sc:

V (#23) [Ar] 4s2 3d3 so again valence electrons are the 4s2 and so it looks like this V:

Cr(#24) [Ar] 4s1 3d5 note that 1 4s electrons moved to 3d, so dot structure is Cr•

Maybe you can do the others. Hint: Cu is also odd, so watch out for that one.