Physics 2000 Science Trek The Periodic Table

Valence Electrons

The name "valence electrons" obviously comes from the older idea of valences; the mysterious numbers Mendeleev used can now be explained via electron configurations. Look again at the applet and the valence chart below, and see if you can tell why the valence system worked and what the numbers really mean.

1 0
1 2 3 4 3 2 1 0
1 2 3 4 3 2 1 0
1 2
transition metals
3 4 3 2 1 0
...

Electron configurations will also explain why the transition metals didn't fit the pattern, as you'll soon see.



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