How do you find valence electrons

Question

anonymous · Answer

you never really know where electrons are, by using schrondinger's equation you can find a 95% chance where they can be. $$\Delta x \Delta p \ge h/2$$

anonymous · Answer

and enter a thousand other variables in this equation. :(

anonymous · Answer

I think you're looking to find out how to find valence electrons on a periodic table right? If so, then the key to your question lies in the numbers at the top of each column on the table. Na has a valence of 1, Mg a valence of 2, B a valence of 3, C a valence of 4, N a valence of 5 and so on and so forth. Yes, the whole column has the same number of valence electrons so Fluorine, chlorine, and bromine all have 7 valence electrons. My chemistry is a little rusty, but i hope i answered your question.